sink/mysql(ticdc): make mysql sink to handle ipv6 address correctly (#6141)

[ti-chi-bot]

This is an automated cherry-pick of #6141

What problem does this PR solve?

Issue Number: ref #6135

What is changed and how it works?

correctly handle the ipv6 address. Add [] for it.

The Hostname() API removes it, but [] must be added for it to be the correct dsn.

Check List

Tests

• Unit test
• Manual test (sink/mysql(ticdc): make mysql sink to handle ipv6 address correctly #6141 (comment))

Questions

Will it cause performance regression or break compatibility?

No

Do you need to update user documentation, design documentation or monitoring documentation?

No

Release note

Fix the problem that TiCDC cannot correctly recognize the ipv6 address in SinkURI

[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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[ti-chi-bot]

@ti-chi-bot: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
jenkins-ticdc/verify	efb3e1d	link	true	/test verify

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