feat: LEAP-648: Reset and recalculate project summary

[makseq]

Adds "Reset Cache" button to the Danger Zone page within project settings. Tested using pytest rather than tavern for fine-grained control over the contents of ProjectSummary json fields

[netlify]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (27a0714) 75.88% compared to head (f94e426) 75.92%.
Report is 4 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #5432      +/-   ##
===========================================
+ Coverage    75.88%   75.92%   +0.03%     
===========================================
  Files          154      154              
  Lines        12931    12959      +28     
===========================================
+ Hits          9813     9839      +26     
- Misses        3118     3120       +2     

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