ci(freezegun): fix leaky test causing flakes

[brettlangdon]

This is a common flake in CI, we found that one of the tests was changing the global configuration without resetting it.

The leaky test was found with https://github.com/asottile/detect-test-pollution

Checklist

• PR author has checked that all the criteria below are met
• The PR description includes an overview of the change
• The PR description articulates the motivation for the change
• The change includes tests OR the PR description describes a testing strategy
• The PR description notes risks associated with the change, if any
• Newly-added code is easy to change
• The change follows the library release note guidelines
• The change includes or references documentation updates if necessary
• Backport labels are set (if applicable)

Reviewer Checklist

• Reviewer has checked that all the criteria below are met
• Title is accurate
• All changes are related to the pull request's stated goal
• Avoids breaking API changes
• Testing strategy adequately addresses listed risks
• Newly-added code is easy to change
• Release note makes sense to a user of the library
• If necessary, author has acknowledged and discussed the performance implications of this PR as reported in the benchmarks PR comment
• Backport labels are set in a manner that is consistent with the release branch maintenance policy

[github-actions]

CODEOWNERS have been resolved as:

tests/contrib/freezegun/test_freezegun.py                               @DataDog/ci-app-libraries

[github-actions]

Bootstrap import analysis

Comparison of import times between this PR and base.

Summary

The average import time from this PR is: 274 ± 2 ms.

The average import time from base is: 275 ± 1 ms.

The import time difference between this PR and base is: -1.52 ± 0.07 ms.

Import time breakdown

The following import paths have shrunk:

ddtrace.auto 1.965 ms (0.72%)

ddtrace.bootstrap.sitecustomize 1.274 ms (0.47%)

ddtrace.bootstrap.preload 1.274 ms (0.47%)

ddtrace.internal.remoteconfig.client 0.623 ms (0.23%)

ddtrace 0.691 ms (0.25%)

ddtrace.internal._unpatched 0.050 ms (0.02%)

json 0.028 ms (0.01%)

json.decoder 0.028 ms (0.01%)

re 0.028 ms (0.01%)

enum 0.028 ms (0.01%)

types 0.028 ms (0.01%)

subprocess 0.022 ms (0.01%)

contextlib 0.022 ms (0.01%)

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-06-16 13:16:08

Comparing candidate commit 20556c8 in PR branch brettlangdon/fix.freegun.flaky.test with baseline commit 5692392 in branch main.

Found 0 performance improvements and 1 performance regressions! Performance is the same for 560 metrics, 3 unstable metrics.

scenario:iastaspectssplit-splitlines_aspect

• 🟥 execution_time [+106.287ns; +145.349ns] or [+7.171%; +9.806%]