[Anatolii Yatsuk (tolik0)]

What

Fixes two unit-test flakes that fail unrelated PRs (for example #1232):

• JWT tests (unit_tests/sources/declarative/auth/test_jwt.py): test_get_signed_token, test_get_request_options and test_get_request_headers now run under freezegun.freeze_time, as test_get_jwt_payload already does.
• Config-migration fixtures (migration_mocks in test_manifest_declarative_source.py and test_concurrent_declarative_source.py): open and print are now patched only in the module under test, not in builtins.

Why

• The JWT tests build the expected token with a second call to _get_jwt_payload(). When a second boundary falls between that call and the authenticator's own call, iat, nbf and exp differ and the tokens don't match. This failed test_get_request_options[test_get_request_headers1] on Python 3.11 and test_get_signed_token on Python 3.12 in the same run.
• Patching builtins.open catches every open call in the process during the test. In CI, ddtrace read /proc/self/cgroup and wrote a .pyc cache file through the mock, so assert_called_once_with("/fake/config/path", "w") failed with Expected 'open' to be called once. Called 6 times.

Verification

• poetry run pytest unit_tests/sources/declarative/auth/test_jwt.py unit_tests/legacy/sources/declarative/test_manifest_declarative_source.py unit_tests/sources/declarative/test_concurrent_declarative_source.py -k "jwt or Jwt or migrat": 27 passed.
• ruff format and ruff check are clean.
• Test-only change; no runtime code is touched.

🤖 Generated with Claude Code

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[github-actions]

PyTest Results (Fast)

5 838 tests  ±0   5 807 ✅ ±0   9m 45s ⏱️ + 1m 36s
    1 suites ±0      31 💤 ±0 
    1 files   ±0       0 ❌ ±0 

Results for commit 0598f91. ± Comparison against base commit 8b721cd.

[github-actions]

PyTest Results (Full)

5 841 tests  ±0   5 810 ✅ ±0   16m 18s ⏱️ -23s
    1 suites ±0      31 💤 ±0 
    1 files   ±0       0 ❌ ±0 

Results for commit 0598f91. ± Comparison against base commit 8b721cd.