Original PR description

### [IMP] account_reports: allow adding custom warnings

This commit adds a hook `_get_custom_warnings` to add custom warnings in
custom report handlers easier without needing to
extend the custom_line_postprocessor.
Warnings might still be added when generating dynamic
lines for performance reasons.

### [IMP] l10n_lu_reports: switch validation errors into warnings

Currently, we do a validation when an XML is being exported.
If there are several checks that fail one after another, the users
have to try to export, face the error, fix, try to export again several times.
This commit changes these into warnings.
We allow exporting XML despite these warnings, so that users are not blocked
that way.

task-3556111

Original PR description

The Australian government allows companies to report their payroll
activities through a kind of tax report. To fill the tax report lines
representing these activities, we need to update the modules in order to
add tax tags when creating entries from the payslips.

We thought that payroll generated entries could happen more than in one
localisation, so we applied the principle to hr_payroll_account.
Following this idea, we now have tags that can be set directly on the
hr salary rules or hr payslip lines. These tags will be applied on the
corresponding lines when creating the journal entry from the payslip.

For the Australian payroll, we need to be able to change the W2 tag to
W3 by a boolean on the contract, as the default data for salary
structures will represent all the use cases possible (we don't want
users to duplicate structures just to change the tag).

task-2719708

Original PR description

Before this commit: When you want to edit skill on a confirmed appraisal, a form view was displayed to do it. With this commit, you can directly edit the line without form view.

task: 3612532

Original PR description

Adds two new fields in the settings to disable predicting accounts and taxes on vendor bill lines.

task-3512211

Original PR description

This commit converts server actions from python
to more user friendly interface.

The commit also improves `_create_records_with_xml_ids`,
by removing try/except block and doing same thing using
ORM.

Commit also adds test, that tests the functionality of
`_create_records_with_xml_ids` function.

task-3597555