This commit enables ai to add javascript to the page, when it's needed.
By default, scripts are added as a last resort.
Firstly, AI tries to satisfy the user's prompt with HTML/CSS changes,
and when it's not possible, we allow AI to add javascript.

Because static analysis of custom js scripts is quite limited, a
dedicated LLM safety reviewer is introduced to validate proposed code.
To ensure safety, the review fails if any vulnerability or
suspicious pattern is detected, or if the reviewer call itself fails.

In addition, to make sure ai scripts don't mess up the history, and that
we properly clean up everything that ai generated, we prompt AI to wrap
every part of the code that changes the DOM interactively in a wrapper
`__aiProtectMutations`, which handles mutations done right after this
call, so we can easily track the changes made by ai script, in order to
easily reset modifications made by ai before saving the page, or when
entering the edit mode. Also, in the edit mode this wrapper ignores the
mutations made by the script.

To make it more-or-less work acceptably, we stop the execution of ai
generated scripts on entering the translation.
Also, we add a builder option to pause the execution of the ai scripts
in a snippet, so users can easily edit it.
We prompt AI not to hardcode strings on state change, but instead have
a few different blocks with necessary text and show/hide them with
d-none. This way we show every text block when scripts don't run to be
able to edit them.

task-6144157