test(django): Fix flaky cache tests by using uuid for cache LOCATION

[sentry-junior]

Root cause

test_cache_spans_item_size[True] and test_cache_spans_decorator[True] have been intermittently failing on master (observed 3x each in the last ~150 CI runs, e.g. run 34096255656) with:

tests/integrations/django/test_cache_module.py:764: in test_cache_spans_item_size
    assert not spans[0]["attributes"]["cache.hit"]
E   assert not True

use_django_caching / use_django_caching_with_middlewares gave each test a "unique" Django LocMemCache namespace via "unique-snowflake-%s" % random.randint(1, 1_000_000). Django's LocMemCache backend keeps its data keyed by LOCATION in a module-level dict for the lifetime of the test process. With only ~1e6 possible values and hundreds of tests using this fixture in a session, the birthday problem gives a non-trivial chance that two different test invocations pick the same LOCATION. When that happens, a later test's very first cache.get() call sees a cache entry left behind by an earlier (unrelated) test, so cache.hit comes back True instead of the expected False, failing the assertion.

Fix

Use uuid.uuid4() (already imported in this file) instead of random.randint(1, 1_000_000) for the cache LOCATION, guaranteeing no collisions across the test session. Removed the now-unused random import.

Verification

• pytest tests/integrations/django/test_cache_module.py — 37 passed
• ruff check tests/integrations/django/test_cache_module.py — clean

via neel.

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View Junior Session [Sentry]

[github-actions]

Codecov Results 📊

✅ 131905 passed | ⏭️ 7131 skipped | Total: 139036 | Pass Rate: 94.87% | Execution Time: 468m 40s

📊 Comparison with Base Branch

Metric	Change
Total Tests	📈 +1330
Passed Tests	📈 +1321
Failed Tests	—
Skipped Tests	📈 +9

All tests are passing successfully.

✅ Patch coverage is 100.00%. Project has 2527 uncovered lines.
✅ Project coverage is 90.2%. Comparing base (1e758fa) to head (f94120a).

Coverage diff

@@            Coverage Diff             @@
##        master       #PR       +/-##
==========================================
+ Coverage    90.20%    90.20%        —%
==========================================
  Files          193       193         —
  Lines        25788     25788         —
  Branches      9530      9530         —
==========================================
+ Hits         23261     23261         —
- Misses        2527      2527         —
- Partials      1432      1432         —

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