sink(ticdc): remove duplicate sort about open protocol

[wk989898]

What problem does this PR solve?

Issue Number: ref #10913

What is changed and how it works?

Repeat with the following code https://github.com/pingcap/tiflow/blob/45c831ae03b066caf7b23d1542cdb57e6c28028e/pkg/sink/codec/open/open_protocol_message.go#L229-L231

Check List

Tests

• Unit test
• Integration test

Questions

Will it cause performance regression or break compatibility?

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

Release note

`None`.