[release-16.0] Flakes: Delete VTDATAROOT files in reparent test teardown within CI (#13793)

[vitess-bot]

Description

This is a backport of #13793

[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.

Tests

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Documentation

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Backward compatibility

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