ddl: enable goleak for ingest package

[tangenta]

What problem does this PR solve?

Issue Number: close #43764

Problem Summary:

As the title said.

What is changed and how it works?

• Add a simple adding index test for tidb_enable_dist_task.
• Add goleak check for ingest package.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• 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

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• hawkingrei
• wjhuang2016

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[hawkingrei]

/test all

[tangenta]

/hold

[tangenta]

/unhold

[hawkingrei]

/merge

[ti-chi-bot]

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

Commit hash: 806de4e

[tangenta]

/merge

[ti-chi-bot]

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

Commit hash: 442a106

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #43848.