[ISSUE-30478] Release cache dir lock acquired by a command on sigint or sigterm

[dratushnyy]

Description

The goal of this PR is to fix an existing issue related to the cache dir lock file.

To resolve the issue, a call to Cache.releaseLockEarly() was added into commands handlers for SIGTERM and SIGINT.

Related Issues

#30478

Tests

I added the following tests:
flutter_tools/test/general.shard/flutter_command_test.dart: command release lock on kill signal

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Breaking Change

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[zanderso]

Thanks for the PR!

[zanderso]

Thanks!

[lock]

This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of flutter doctor -v and a minimal reproduction of the issue.