feat(cdc): record cdc auto schema change failure events in rw_event_log

[wcy-fdu]

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What's changed and what's your intention?

As title

Show cdc auto schema change fail event in rw_event_logs:

select * from rw_event_logs where event_type = 'AUTO_SCHEMA_CHANGE_FAIL' order by timestamp desc;

Example1: fail due to unsupported type

------------------------------------------------------
unique_id  | 357742df-5f0d-4b6e-a1ab-e77c338bf42a
timestamp  | 2025-09-05 10:45:24.213+00:00
event_type | AUTO_SCHEMA_CHANGE_FAIL
info       | {"autoSchemaChangeFail": {"cdcTableId": "s.public.t", "failInfo": "Unsupported postgres type 'hstore' in table 'public.t'", "tableId": 6, "tableName": "public.t"}}

Example2: fail due to the ddl is not add column or drop column

unique_id  | 4792fc05-54ae-44dc-bcda-0bdb5d63aaea
timestamp  | 2025-09-05 10:48:22.691+00:00
event_type | AUTO_SCHEMA_CHANGE_FAIL
info       | {"autoSchemaChangeFail": {"cdcTableId": "6.public.t", "failInfo": "New columns should be a subset or superset of the original columns (including hidden columns), since only `ADD COLUMN` and `DROP COLUMN` is supported", "tableId": 8, "tableName": "t", "upstreamDdl": "UNKNOWN_DDL"}}

Checklist

• I have written necessary rustdoc comments.
• I have added necessary unit tests and integration tests.
• I have added test labels as necessary.
• I have added fuzzing tests or opened an issue to track them.
• My PR contains breaking changes.
• My PR changes performance-critical code, so I will run (micro) benchmarks and present the results.
• I have checked the Release Timeline and Currently Supported Versions to determine which release branches I need to cherry-pick this PR into.

• My PR needs documentation updates.

Release note

[hzxa21]

You are accessing the "id" field here (duplicate with L214), not the table name

[hzxa21]

ditto

[hzxa21]

We have the source name available in self.source_ctx.source_name. We should include that in the error message.

[hzxa21]

ditto