Settings: Fix settings for inactive projects

[BigRoy]

Brief description

This fixes Settings reading and saving for inactive projects.

⚠️ NOTE: This makes openpype.client.get_project argument inactive default to True.
And openpype.client.get_projects argument inactive still defaults to False like before.

I felt that was a much more logical default value for a function whose sole function is to get a single project by name - it should just return it if found by default. Having this filtered by default would also break a lot of other code too if you would be working inside the DCC and the project would be set to inactive.

Description

The Project Settings did not read the project settings (anatomy data) for an inactive project and thus the UI would just show the default values.

Saving the settings for an inactive project would error:

Traceback (most recent call last):
  File "S:\openpype\OpenPype\openpype\tools\settings\settings\categories.py", line 441, in save
    self.entity.save()
  File "S:\openpype\OpenPype\openpype\settings\entities\root_entities.py", line 410, in save
    self._save_project_values()
  File "S:\openpype\OpenPype\openpype\settings\entities\root_entities.py", line 887, in _save_project_values
    self._save_studio_values()
  File "S:\openpype\OpenPype\openpype\settings\entities\root_entities.py", line 875, in _save_studio_values
    save_project_anatomy(self.project_name, project_anatomy)
  File "S:\openpype\OpenPype\openpype\settings\lib.py", line 49, in wrapper
    return func(*args, **kwargs)
  File "S:\openpype\OpenPype\openpype\settings\lib.py", line 261, in save_project_anatomy
    _SETTINGS_HANDLER.save_project_anatomy(project_name, anatomy_data)
  File "S:\openpype\OpenPype\openpype\settings\handlers.py", line 581, in save_project_anatomy
    self._save_project_anatomy_data(project_name, data_cache)
  File "S:\openpype\OpenPype\openpype\settings\handlers.py", line 613, in _save_project_anatomy_data
    ).format(project_name))
ValueError: Project document of project "test" does not exists. Create project first.

Additional info

I tried fixing it locally in Settings handlers here and here but turning it into get_project(project_name, inactive=True).

That did fix the querying and viewing of the settings in the UI but still disallowed saving the project correctly.

Also reported on OpenPype Discord here.

Testing notes:

1. Set Project Setting project_anatomy/attributes/active to False.
2. Try to refresh the settings UI for that project
3. Try to save the settings for that project.
4. Ensure other code relying on get_project also still behaves as intended

[BigRoy]

By the way, that raises the question @mkolar - should we invert the default for get_projects too? So that by default it returns ALL projects, unless you specify get_projects(inactive=False)? Currently it would filter out inactive projects by default when doing get_projects().