Fix error message check on query timeout

[GuptaManan100]

Description

This PR fixes the error messages check in the test TestOverallQueryTimeout. This is a test we introduced recently and noticed that there are actually two possible error messages that can be received based on whether it was vttablet or vtgate that sent it. This PR fixes the test expectations to align with this.

Related Issue(s)

Checklist

• [x] "Backport to:" labels have been added if this change should be back-ported to release branches
• [x] If this change is to be back-ported to previous releases, a justification is included in the PR description
• [x] Tests were added or are not required
• [x] Did the new or modified tests pass consistently locally and on CI?
• [x] Documentation was added or is not required

Deployment Notes

[vitess-bot[bot]]

Review Checklist

Hello reviewers! :wave: Please follow this checklist when reviewing this Pull Request.

General

• [ ] Ensure that the Pull Request has a descriptive title.
• [ ] Ensure there is a link to an issue (except for internal cleanup and flaky test fixes), new features should have an RFC that documents use cases and test cases.

Tests

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• [ ] Protobuf changes should be wire-compatible.
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• [ ] RPC changes should be compatible with vitess-operator
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• [ ] vtctl command output order should be stable and awk-able.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 69.50%. Comparing base (490bb0c) to head (bc8cd61). Report is 9 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #16827 +/- ## ========================================== - Coverage 69.51% 69.50% -0.01% ========================================== Files 1568 1569 +1 Lines 202426 202517 +91 ========================================== + Hits 140717 140763 +46 - Misses 61709 61754 +45 ```

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