fix(tests): improve signal handling and error reporting in lock tests

[creativeprojects]

No description provided.

[Copilot]

Pull request overview

This PR updates the lock-related test suite to make interrupt handling more consistent across platforms and to improve diagnostics/behavior when the helper process exits unexpectedly.

Changes:

• Wrap TestBackupWithResticLockFailureRetried in synctest.Test to better control timing-related behavior.
• Update the lock helper program to only handle os.Interrupt and adjust signal setup.
• Improve lock tests’ interrupt signaling and add isSignalError to skip an “inconclusive” run when the child process appears to have been terminated by a signal.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
wrapper_test.go	Uses testing/synctest to make the “lock failure retried” test less timing-sensitive.
lock/test/main.go	Changes how the helper binary registers/ignores signals, focusing on os.Interrupt.
lock/lock_test.go	Sends os.Interrupt instead of SIGINT and adds isSignalError to improve error handling/skip logic in flaky scenarios.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.76%. Comparing base (6b42080) to head (8f1f3cf).
⚠️ Report is 1 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #622   +/-   ##
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  Coverage   80.76%   80.76%           
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  Files         164      164           
  Lines       12116    12116           
=======================================
  Hits         9785     9785           
  Misses       1836     1836           
  Partials      495      495           

Flag	Coverage Δ
unittests	79.04% <ø> (ø)

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