Validate/add custom User-Agent for OSM/OSMCha requests

[susilnem]

Addresses

• 403 forbidden issue on validate osm/osmcha api calls.

Changes

• user custom user agent mapswipe-APP_ENVIRONMENT/APP_RELEASE

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 (6c9dd95) to head (4243a81).
⚠️ Report is 3 commits behind head on develop.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #247   +/-   ##
========================================
  Coverage    87.41%   87.41%           
========================================
  Files          205      205           
  Lines        12458    12461    +3     
  Branches      1049     1049           
========================================
+ Hits         10890    10893    +3     
  Misses        1181     1181           
  Partials       387      387           

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