ddl_puller (ticdc): handle dorp pk/uk ddl correctly (#10965)

[ti-chi-bot]

This is an automated cherry-pick of #10965

What problem does this PR solve?

Issue Number: close #10890

What is changed and how it works?

When handling a DDL job in ddlPuller, check if it will transition the table from eligible to ineligible. If so, return an error and stop the changefeed. The error message should provide instructions for the user on how to manage the situation.

Check List

Tests

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

1. Create a table t1.

CREATE TABLE t1 (
id INT PRIMARY KEY /*T![clustered_index] NONCLUSTERED */,
name VARCHAR(255),
email VARCHAR(255) UNIQUE
);

3. Drop its primary key.

ALTER TABLE t1 DROP PRIMARY KEY; 

4. List this changefeed.

-> # ./cdc cli changefeed list 
[
  {
    "id": "test",
    "namespace": "default",
    "summary": {
      "state": "warning",
      "tso": 449299724779651075,
      "checkpoint": "2024-04-24 15:07:11.563",
      "error": {
        "time": "2024-04-24T16:52:17.129593307+08:00",
        "addr": "127.0.0.1:8300",
        "code": "CDC:ErrProcessorUnknown",
        "message": "An eligible table become ineligible after DDL: [alter table t1 drop primary key] it is a dangerous operation. If you want to replicate this ddl, pelase pause the changefeed and update the `force-replicate=true` in the changefeed configuration, then resume the changefeed. Otherwise, will cause data loss."
      }
    }
  }
]

5. Update the changefeed's config as the instructions in the error message and resume the changefeed. Check the CDC log to confirm if the DDL was replicated.

[2024/04/24 16:55:09.679 +08:00] [INFO] [ddl_manager.go:558] ["execute a ddl event successfully"] [ddl="ALTER TABLE `t1` DROP PRIMARY KEY"] [namespace=default] [changefeed=test] ....

Questions

Will it cause performance regression or break compatibility?

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

Release note

Fix a bug that might cause the replication of the 'drop primary key' or 'drop unique key' DDL to be lost.

[codecov]

Codecov Report

Attention: Patch coverage is 55.55556% with 16 lines in your changes are missing coverage. Please review.

❗ No coverage uploaded for pull request base (release-8.1@5e1b22e). Click here to learn what that means.

Additional details and impacted files

Components	Coverage Δ
cdc	61.9151% <0.0000%> (?)
dm	51.2293% <0.0000%> (?)
engine	63.3879% <0.0000%> (?)

Flag	Coverage Δ
unit	57.5073% <55.5555%> (?)

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This pull-request has been approved by: asddongmen

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