privilege: fix RequestVerificationWithUser use of default roles (#24442)

[ti-srebot]

cherry-pick #24442 to release-4.0
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# In tidb repo:
git pr https://github.com/pingcap/tidb/pull/24531

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git push git@github.com:ti-srebot/tidb.git pr/24531:release-4.0-b8cad01bef30

---

What problem does this PR solve?

Issue Number: close #24414

Problem Summary:

Views support a feature to run in the security of the DEFINER. This is useful because it allows column level / row level security to effectively be supported, when TiDB supports neither.

However, the implementation was buggy because RequestVerificationWithUser in the privilege API did not consider default roles for that user correctly. In this fix it now does.

What is changed and how it works?

What's Changed:

Bug fix only.

Related changes

• Need to cherry-pick to the release branch

Check List

Tests

• Integration test

Side effects

• None

Release note

• SQL Views now consider the default roles associated with the SQL DEFINER correctrly.

[ti-srebot]

/run-all-tests

[ti-srebot]

@morgo please accept the invitation then you can push to the cherry-pick pull requests.
https://github.com/ti-srebot/tidb/invitations

[bb7133]

/lgtm

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• bb7133
• wjhuang2016

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[bb7133]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 7514eed

[ti-chi-bot]

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[zhouqiang-cl]

/merge