[python] fix(debugger): only run test when ddtrace > 3.15.0

[tylfin]

Motivation

I introduced this in a previous change, but the tests should skip this test when ddtrace is less than v3.15.0, not when it is greater than or equal to v3.15.0.

Changes

• Updated the @missing_feature decorators in test_log_line_snapshot_debug_track and test_log_line_snapshot_new_destination to skip tests only for Python versions less than 3.15.0, aligning with when the track change was introduced. [1] [2]

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Reviewer checklist

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[github-actions]

CODEOWNERS have been resolved as:

tests/debugger/test_debugger_probe_snapshot.py                          @DataDog/debugger @DataDog/system-tests-core