GlobalContributions: Highlight pending edits (FlaggedRevs extension)

[agoujot]

Changes are roughly:

• add method to project to get if a given project has FlaggedRevs on. for this also tweak getinstalledextensions to use projectrepository's capacity to get any project's (not only $this's) extensions
• in globalcontribs' getrevisions, for each project, if it has flaggedrevs, outer join on flaggedpages and select whether it's pending( this check is actually ugly due to how flaggedrevs works)
• add the pending property to edit, and an exposed method to get it, and set it using attrs' is_pending
• add i18n for pending msg
• add styling for pending (make it stand out just a bit less than reverted)
• highlight and label in twig

Bug: T322466

[codecov]

Codecov Report

Attention: Patch coverage is 11.11111% with 8 lines in your changes missing coverage. Please review.

Project coverage is 71.09%. Comparing base (4b8eb28) to head (862dea8).
Report is 103 commits behind head on main.

Files with missing lines	Patch %	Lines
src/Model/Project.php	0.00%	6 Missing ⚠️
src/Model/Edit.php	33.33%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #531      +/-   ##
============================================
- Coverage     71.30%   71.09%   -0.22%     
- Complexity     1275     1299      +24     
============================================
  Files            46       46              
  Lines          3792     3913     +121     
============================================
+ Hits           2704     2782      +78     
- Misses         1088     1131      +43     

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