feat(project): increase max area to 2500sqkm for validate

[tnagorra]

Changes

• Increase max area constraint for validate project AOI
• Add "offset" custom option for validate project

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 (tests here too)
• translations

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.41%. Comparing base (df87510) to head (d96d6c7).
⚠️ Report is 3 commits behind head on develop.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #223   +/-   ##
========================================
  Coverage    87.40%   87.41%           
========================================
  Files          205      205           
  Lines        12458    12458           
  Branches      1049     1049           
========================================
+ Hits         10889    10890    +1     
  Misses        1181     1181           
+ Partials       388      387    -1     

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