binlog: fix show pump/drainer status (#44764)

[ti-chi-bot]

This is an automated cherry-pick of #44764

What problem does this PR solve?

Issue Number: ref #42643

Problem Summary:

What is changed and how it works?

In the past code we directly use tidb's global config path to create etcd registry. After this PR we use binlog client's etcd registry to do the following staff. Binlog client will update etcd urls in time.

Check List

Tests

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

Side effects

• None

Documentation

• None

Release note

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

None

[ti-chi-bot]

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[ti-chi-bot]

This pull request is closed because its related version has closed automatic cherry-picking.
If it's still needed, you can reopen it or just regenerate it using bot,
see:

https://prow.tidb.net/command-help#cherrypick
https://book.prow.tidb.net/#/plugins/cherrypicker