ref(tracing): Move TRANSACTION_SOURCE_* constants to Enum

[mgaligniana]

Fixes GH-2696

[codecov]

Codecov Report

Attention: Patch coverage is 87.17949% with 5 lines in your changes missing coverage. Please review.

Project coverage is 80.15%. Comparing base (8a70b76) to head (6609d89).

Files with missing lines	Patch %	Lines
sentry_sdk/integrations/fastapi.py	50.00%	1 Missing ⚠️
sentry_sdk/integrations/gcp.py	0.00%	1 Missing ⚠️
sentry_sdk/integrations/litestar.py	50.00%	1 Missing ⚠️
sentry_sdk/integrations/starlette.py	66.66%	1 Missing ⚠️
sentry_sdk/integrations/starlite.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3889      +/-   ##
==========================================
- Coverage   80.16%   80.15%   -0.02%     
==========================================
  Files         139      139              
  Lines       15394    15396       +2     
  Branches     2596     2597       +1     
==========================================
  Hits        12341    12341              
- Misses       2207     2215       +8     
+ Partials      846      840       -6     

Files with missing lines	Coverage Δ
sentry_sdk/integrations/aiohttp.py	80.11% <ø> (ø)
sentry_sdk/integrations/arq.py	89.84% <100.00%> (ø)
sentry_sdk/integrations/asgi.py	85.61% <100.00%> (ø)
sentry_sdk/integrations/aws_lambda.py	28.43% <100.00%> (-2.95%)	⬇️
sentry_sdk/integrations/celery/__init__.py	86.66% <100.00%> (ø)
sentry_sdk/integrations/chalice.py	89.18% <100.00%> (ø)
sentry_sdk/integrations/django/__init__.py	81.48% <100.00%> (ø)
sentry_sdk/integrations/grpc/aio/server.py	86.44% <100.00%> (ø)
sentry_sdk/integrations/grpc/server.py	76.31% <100.00%> (ø)
sentry_sdk/integrations/huey.py	91.66% <ø> (ø)
... and 13 more

... and 3 files with indirect coverage changes

[mgaligniana]

Linter is failing because of:

Should I fix them in a different commit?

[antonpirker]

nice! thanks for the cleanup

[antonpirker]

Linter is failing because of:

Should I fix them in a different commit?

no, this is because of a new release of mypy. I will fix this.

[antonpirker]

This breaks a lot of tests, because the full enum ends up in the envelope that is sent to Sentry and not the .value of the enum. Can you please fix this?

[antonpirker]

Please fix the tests, by making sure the .value of the enum (the string) ends up in the envelop json payload that is sent to Sentry.

[mgaligniana]

Thank you @antonpirker! Now linter and tests passing! 💪