Fix #4710: Added Ad-Hoc Maintenance Option

[IllianiCBT]

• Updated the unit right-click menu to include an option to immediately perform maintenance.

Fix #4710

Dev Notes

This gives players much more control over when maintenance checks are made, allowing them to change up the tempo as they see fit.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 11.43%. Comparing base (f44952c) to head (df51b84).
Report is 6 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6588      +/-   ##
============================================
- Coverage     11.43%   11.43%   -0.01%     
  Complexity     6451     6451              
============================================
  Files          1087     1087              
  Lines        139447   139474      +27     
  Branches      21560    21566       +6     
============================================
+ Hits          15944    15945       +1     
- Misses       121908   121935      +27     
+ Partials       1595     1594       -1     

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