breaking: Remove Spotlight Django integration

[BYK]

We are moving away from Spotlight's overlay mode with its new versions so removing this integration from the SDK too.

Ref getsentry/spotlight#891

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.78%. Comparing base (ebd77f2) to head (e610536).
⚠️ Report is 1 commits behind head on potel-base.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@ Coverage Diff @@ ## potel-base #4747 +/- ## ============================================== + Coverage 84.56% 84.78% +0.22%  ============================================== Files 158 158 Lines 16162 16093 -69 Branches 2575 2564 -11 ============================================== - Hits 13667 13645 -22  + Misses 1700 1655 -45  + Partials 795 793 -2 

Files with missing lines	Coverage Δ
sentry_sdk/spotlight.py	81.39% <ø> (+23.35%)	⬆️

... and 3 files with indirect coverage changes