(Originally started at https://github.com/odoo/enterprise/pull/105183 in preparation of https://github.com/odoo/enterprise/pull/103404, those were replaced by this one for part 1 and https://github.com/odoo/enterprise/pull/105217 for part 2 (not done yet))

Main goal of this part 1: allow no-microphone calls when auto-redirect (desk phone)
    
When a user calls someone and that their profile is configured to use their desk phone (in which case it will call the desk phone and then call the callee to redirect them to the desk phone call), it simply did not make sense to ask for the microphone: it won't be used. This commit makes it so the call proceeds without microphone so it can be automatically redirected immediately.

Then needed commit to fix related things:

[FIX] voip: properly leave in-call after all UserMedia errors
    
    Steps to reproduce:
    - Call someone via the softphone
    - When asked, reject the use of the microphone
    - An error appears, close it
    => You are now on the in-call screen and you have no way to leave it
       even though the call is terminated.
    
    This cames from a combination of [1] and [2]. The parent commit from
    here provides some additional details: `activeSession` is not set at
    the same place anymore (which is wanted to ask the microphone before
    reaching the in-call screen), but because of [2] it ends up being set
    while it should not. See extra details below.
    
    This commit takes the opportunity to fix two other related issues:
    - When calling, if the microphone was rejected (but existing), it
      used to make a traceback before [1]. After [1], it overrode the error
      indicating the problem by another one. This originated from [2] which
      blocked "NotAllowed" microphones, ignoring the other causes and
      ignoring the fact the traceback occurred because all the "invite"
      calling stack was not properly awaited/guarded. Now, after [1],
      everything is properly awaited/guarded so this can simply be removed.
      As a bonus, we mark all microphone errors already handled so they are
      not removed by another less understandable error later.
    - Kinda the same thing and actually found by [1] too: when *accepting*
      a call, microphone issues were shown but then overridden by less
      understandable error messages too. This is now fixed the same way.
    
    [1]: https://github.com/odoo/enterprise/commit/942f32316ab02d8c739fe7fdd5ec2bdde472a68e
    [2]: https://github.com/odoo/enterprise/commit/6570a9735de62130b6451202fb33fac70a0e7901

[FIX] voip: properly access voip Session during UserMedia failure
    
    Commit [1] changed quite a lot of things when it comes to call creation
    and acceptation, sip session and call record creation order, etc. The
    problem here is due to a particular change: before, the `activeSession`
    was set before trying to `invite`/`accept`. It is now only set before
    for `accept`, but not for `invite`. This makes it so that rejecting the
    microphone during call acceptation works but rejecting the microphone
    while trying to call not work. Indeed the `hangup` call being done on
    microphone access check failure, it needs the `activeSession` to be set.
    This resulted in the call (and its record) not being updated as we wish,
    but terminated on SIP.js side.
    
    However, simply restoring the `activeSession` being set earlier would
    not be ideal: it came with the advantage of not starting the in-call
    screen and dial ringtone before the microphone was actually accepted
    when trying to call.
    
    Instead this commit makes it so the VoIP Session object is passed
    through SIP options objects and then accessible in the UserMedia failure
    callbacks. Maybe using the VoIP Session object inside a callback used by
    SIP.js to configure the inner SIP session is not ideal but it can always
    be improved later.
    
    Note: after calling and blocking the microphone, you are stuck on the
    in-call screen after discarding the error, this will be fixed in another
    commit.
    
    [1]: https://github.com/odoo/enterprise/commit/942f32316ab02d8c739fe7fdd5ec2bdde472a68e

[IMP] voip: simplify `mediaStreamFactory` definition
    
    Instead of having a getter returning a function, make that function part
    of the `UserAgent` object directly (and pass it (bound properly) to
    the SIP.js library).

[FIX] voip: convert bad call to `triggerError` to new API
    
    Commit [1] introduced a call to VoIP's `triggerError` but used the old
    API, that was changed at [2].
    
    Steps to reproduce:
    - Make a call to someone without a microphone on your computer (not
      blocked by the browser: disabled on the OS side) (or tweak
      `mediaStreamFactory` to simulate that).
    => The error message contains no helpful information.
    
    This commit uses the right API to display the error correctly.
    
    [1]: https://github.com/odoo/enterprise/commit/942f32316ab02d8c739fe7fdd5ec2bdde472a68e
    [2]: https://github.com/odoo/enterprise/commit/49e1595f31c9f8a23d9b18a33b859d3d01221024
    
task-4947771

While using the keypad search input, the user can now navigate the
potential suggestion + more buttons using the up/down keys of their
keyboard.

Also:

[IMP] voip: improve softphone keyboard management
    
    Make the softphone closer to a dialog and other overlay elements of the
    Odoo webclient:
    - Now trap the focus inside the softphone (using tab cycles inside the
      softphone itself).
    - Make sure event handlers of the home screen menu in enterprise are not
      in conflict (e.g. the next commit after this one will allow using
      up/down to navigate keypad search results, the home screen should not
      mess with that).
    - The Escape key now allows to hide the softphone.

[IMP] voip: prevent focusing the backspace button
    
    It is never useful to focus the keypad search's backspace button using
    the keyboard: you would have to tab your way through the search input
    itself anyway, in which case it is easier to use the backspace key on
    your keyboard instead of trying to use the UI one.
    
    Doing this, this also allows to focus the first search result with one
    tab press while inside the input, instead of having to go through the
    backspace button.

And potential follow-up at https://github.com/odoo/enterprise/pull/105047
    
task-5441808