PYTHON-6049 - Allow the full range of possible errors for a CSOT timeout

[NoahStapp]

PYTHON-6049

Changes in this PR

The test_callback_not_retried_after_csot_timeout test explicitly checks that the raised error is an ExecutionTimeout to assert that the CSOT timeout has expired. This is inconsistent with how the unified tests assert the same behavior, which is by checking the timeout attribute on the error itself. Since a CSOT timeout expiring during an operation can raise multiple kinds of errors depending on the exact time and place it occurs, this causes the test to be flaky.

This PR aligns the test with how the unified tests assert for CSOT timeout expiration.

Test Plan

Test changes.

Checklist

Checklist for Author

• [ ] Did you update the changelog (if necessary)?
• Is there test coverage?
• [ ] Is any followup work tracked in a JIRA ticket? If so, add link(s).

Checklist for Reviewer

• Does the title of the PR reference a JIRA Ticket?
• Do you fully understand the implementation? (Would you be comfortable explaining how this code works to someone else?)
• Is all relevant documentation (README or docstring) updated?

[Copilot]

Pull request overview

This PR updates the transactions CSOT regression test to assert timeout semantics (via the exception’s timeout attribute) instead of asserting a single concrete exception type, matching the approach used by the unified CSOT tests and reducing flakiness.

Changes:

• Broaden the expected exception in test_callback_not_retried_after_csot_timeout from ExecutionTimeout to PyMongoError.
• Assert ctx.exception.timeout to validate that the failure was caused by a timeout, regardless of the specific error subclass.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
test/test_transactions.py	Updates the synchronous transactions CSOT test to assert exception.timeout instead of requiring ExecutionTimeout.
test/asynchronous/test_transactions.py	Mirrors the same CSOT assertion change for the asynchronous transactions CSOT test.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[NoahStapp]

Failures are unrelated.