[4.7][Project Manager] Fix Wrap Long Project Title

[CarrotOfPower]

• Fixes Project Manager UI breaks when adding project to list #122075
• Fixes Memory leak when resizing the Project Manager to minimum width #122257
• Fixes index reuse error noted in PR [ProjectList] Fix title index handling on refresh #122037
• Suspendes Various Fixes for Project Title Wrapping #122095
• Introduced in Editor: Wrap Long Project Title #119580

This is meant to be cherry-picked for 4.7.2.

It uses a value for title_size_cache, different to the PR for 4.8 Master, wich replaces the magic number through logic. This value does work in 4.7.x, but not in 4.8 Master.
That's ok, since the 4.7 PM layout won't be drastically changed in future.

• The pendant for 4.8 Master is here: [Project Manager] Fix Wrap Long Project Title #122204 / [Project Manager] Fix Wrap Long Project Title and Compact Mode #122061

What problem(s) does this PR solve?

• This PR fixes all issues with wrapping project titles. For more info, see the two suspended PR.
• Simplifies logic significantly while maintaining the same functionality, fixing issues with long project titles not wrapping correctly.
• Should work on any scale.

#122075

wrap_long_project_title_empty_tag_container_bug.mp4

Difference to #122095

• Fixes at least one bug contained in Various Fixes for Project Title Wrapping #122095 (when I write this).
• Various Fixes for Project Title Wrapping #122095 does NOT fix Memory leak when resizing the Project Manager to minimum width #122257.
• Some Optimizations, which also makes the code cleaner to read.
• The behaviour itself:

This is #122095:

I cherry-picked godotengine/godot#122095 for 4.7 and built it using SCons:

various-fixes-for-project-title-wrapping-applied-on-4.7.mp4

As you may notice ...

• The sizing on the right side is not correct.
• The tags do not resize at first, title and tags share the space somewhere in the middle.
  Also, you see the errors from Memory leak when resizing the Project Manager to minimum width #122257 in the terminal window.

This PR:

4.7.fix-wrap-long-project-title-result-scale-2.2-demo.mp4

It ensures correct sizing and that the tags do resize at first, so the title can take mor space, which can be used more efficiently.
You don't see any errors in the terminal window.

Additional information

Validated by building the Windows editor with SCons and testing it, as well as testing the test artifact for Windows.

[CarrotOfPower]

I did it for 4.7 because

It uses a different value for title_size_cache than the PR for 4.8 Master. This value does work in 4.7.x, but not in 4.8 Master.