test: verify the generated image links are working

[ST-DDT]

Fixes #3112

• Add tests to methods that produce links to ensure they still work #3112

This PR adds a test to the image module/all methods that return a url that actually points to something to ensure the url is working as expected.

Thoughts and Considerations

The current setup only runs these tests in CI to avoid running into "this service might be tracking you" issues when running the tests locally.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.96%. Comparing base (34cf364) to head (972de1b).

Additional details and impacted files

@@           Coverage Diff            @@
##             next    #3127    +/-   ##
========================================
  Coverage   99.96%   99.96%            
========================================
  Files        2798     2798            
  Lines      227806   227806            
  Branches      576      959   +383     
========================================
  Hits       227732   227732            
  Misses         74       74            

see 2 files with indirect coverage changes

[Shinigami92]

The current provided solution feels like mixin unit with integration tests. IMO we should split them from each other. That way, because we rely here also on external sources, we could execute this in a scheduled workflow e.g. every week or so, so we also reduce the "ddos" outgoing from this repo.