Do not use extra threads when cancel mpp query (#5966)

[ti-chi-bot]

This is an automated cherry-pick of #5966

What problem does this PR solve?

Issue Number: ref #5095, close #5631

Problem Summary:

What is changed and how it works?

1. Refine MPPTask::abortTunnels to make MPPTask::abort() non-blocking
2. Don't use extra threads when cancel mpp query
3. Delete some outdated failpoints

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
  • run random failpoints tests more than 12 hours
  • run mpp kill tests more than 12 hours
• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

None

[ti-chi-bot]

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[ti-chi-bot]

@ti-chi-bot: This cherry pick PR is for a release branch and has not yet been approved by release team.
Adding the do-not-merge/cherry-pick-not-approved label.

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