fix(export): save project stats only after exports are updated

[tnagorra]

Changes

• Update project status only after updating the exports
  • We can use project's modified_at or last_contribution_date to partially generate website pages.

This PR doesn't introduce any:

• temporary files, auto-generated files or secret keys
• n+1 queries
• flake8 issues
• print
• typos
• unwanted comments

This PR contains valid:

• tests
• permission checks

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.55%. Comparing base (189901a) to head (03aa9d2).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #269   +/-   ##
========================================
  Coverage    87.55%   87.55%           
========================================
  Files          211      211           
  Lines        12819    12819           
  Branches      1089     1089           
========================================
  Hits         11224    11224           
  Misses        1196     1196           
  Partials       399      399           

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