Fix regex timeout test by reducing timeout from 10ms to 1ms

[Copilot]

The System.Text.RegularExpressions.Tests.RegexMatchTests.Match_TestThatTimeoutHappens test was intermittently failing because the compiled regex engine has become fast enough to complete the catastrophic backtracking operation within the current 10ms timeout, preventing the expected RegexMatchTimeoutException from being thrown.

The test uses the regex pattern a.{20}^ against a large input string (1 million characters) which should cause catastrophic backtracking and trigger a timeout. However, with recent optimizations to the compiled regex engine, this operation sometimes completes within 10ms.

Changes:

• Reduced the timeout value from TimeSpan.FromMilliseconds(10) to TimeSpan.FromMilliseconds(1) in the Match_TestThatTimeoutHappens test method

Testing:

• Verified the test now consistently passes across all regex engine variants (Interpreter, Compiled, NonBacktracking, SourceGenerated)
• Confirmed related timeout tests continue to pass
• The 1ms timeout ensures the test properly validates timeout behavior while remaining robust

Fixes #117111.

---

💬 Share your feedback on Copilot coding agent for the chance to win a $200 gift card! Click here to start the survey.

[ericstj]

/ba-g Android timeouts happening on multiple PRs unrelated to this test.