VReplication: refactor denied tables unit test, add couple more tests

[rohit-nayak-ps]

Description

While debugging an issue reported around denied tables, I ended up refactoring a unit test. It turned out the report was on an older version which had been fixed. But thought it worthwhile to push the test changes.

Related Issue(s)

Checklist

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

Deployment Notes

[vitess-bot]

Review Checklist

Hello reviewers! 👋 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.

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• vtctl command output order should be stable and awk-able.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.25%. Comparing base (3b09eb2) to head (152a2ae).
Report is 16 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15995      +/-   ##
==========================================
- Coverage   68.47%   68.25%   -0.23%     
==========================================
  Files        1562     1562              
  Lines      197083   197319     +236     
==========================================
- Hits       134962   134678     -284     
- Misses      62121    62641     +520     

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[mattlord]

Thanks! ❤️

[mattlord]

We can use require.EqualError to replace both of these checks.