test: backport Phar gzip timing fix for PHP < 7.4

[realFlowControl]

Description

Backport PHP's upstream fix for ext/phar/tests/phar_gzip.phpt on PHP < 7.4 in the shared language-test runner.

The original test compares an in-memory entry timestamp with a timestamp written later into the archive. Crossing a second boundary causes a false failure, see CI:

========DIFF========
005+ timestamp changed, was 1791458152, now 1791458153!
========DONE========
FAIL Phar: gzipped phar [ext/phar/tests/phar_gzip.phpt] 

Reviewer checklist

• Test coverage seems ok.
• Appropriate labels assigned.

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-09T15:51:28.667911Z	08b752d	Draft marked ready
🔒 Security Review	✅ Completed 2026-10-09T15:51:59.405152Z	08b752d	Draft marked ready

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[datadog-datadog-prod-us1-2]

More details

The backport targets the Phar timestamp comparison responsible for false failures when archive creation crosses a second boundary, with the change gated to PHP versions below 7.4. The static reviewer found no actionable defect.

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[datadog-datadog-prod-us1-2]

🎉 All green!

🧪 All tests passed
❄️ No new flaky tests detected

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 68.57% (+0.00%)

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[bwoebi]

adding it to the xfail lists it would've also worked, but fine.