Test: Remove TiDB select tests that depend on get_format

[tenfyzhong]

Description

This change removes the TiDB select test coverage from TiCDC tests.

TiCDC does not use the select get_format function, so keeping this test dependency in TiCDC is unnecessary. When TiDB changes the related select behavior or test cases, it can cause unrelated TiCDC test failures.

Context

The goal is to avoid TiDB-side changes affecting TiCDC tests for functionality that TiCDC does not actually rely on.

Proposed Solution

Remove the TiDB select test related to get_format from TiCDC test coverage, so TiCDC tests only verify behavior that is actually used by TiCDC.

Additional Information

Related PRs:

• expression: make location case insensitive for GET_FORMAT | tidb-test=pr/2658 tidb#65240
• test: update date formats and expected results in MySQL tests  #3931