ref: Clean up get_active_propagation_context

[sl0thentr0py]

Description

No longer returns None since the last isolation_scope branch will always have one setup by the constructor.

Issues

• resolves: Clean up PropagationContext None checks #5216
• resolves: PY-2011

[linear]

PY-2011 Clean up PropagationContext None checks

[codecov]

Codecov Report

❌ Patch coverage is 84.61538% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.25%. Comparing base (1ac88a0) to head (516088e).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
sentry_sdk/scope.py	84.61%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@ Coverage Diff @@## neel/more-prop-context-cleanup #5217 +/- ## ================================================================== + Coverage 84.23% 84.25% +0.01%  ================================================================== Files 181 181 Lines 18458 18446 -12 Branches 3282 3276 -6 ================================================================== - Hits 15549 15542 -7 + Misses 1902 1900 -2 + Partials 1007 1004 -3 

Files with missing lines	Coverage Δ
sentry_sdk/scope.py	89.12% <84.61%> (+1.05%)	⬆️

... and 2 files with indirect coverage changes