Changes

feat: split tidb&tiflow pipelines on branch release-6.5-20241101-v6.5.7 (#3228)

Split tidb&tiflow pipelines on branch release-6.5-20241101-v6.5.7
===

This pull request introduces new Jenkins pipeline jobs for the
`pingcap/tidb` and `pingcap/tiflow` repositories, specifically for the
`release-6.5-20241101-v6.5.7` version. The changes include creating
folders and defining multiple pipeline jobs with log rotation,
parameters, properties, and SCM configurations.

New folder creation:

* Created a new folder for `pingcap/tidb` pipelines
(`jobs/pingcap/tidb/release-6.5-20241101-v6.5.7/aa_folder.groovy`).
* Created a new folder for `pingcap/tiflow` pipelines
(`jobs/pingcap/tiflow/release-6.5-20241101-v6.5.7/aa_folder.groovy`).

New pipeline jobs for `pingcap/tidb`:

* Defined `ghpr_build` pipeline job with log rotation, parameters,
properties, and SCM configuration
(`jobs/pingcap/tidb/release-6.5-20241101-v6.5.7/ghpr_build.groovy`).
* Defined `ghpr_check` pipeline job with similar configurations as
`ghpr_build`
(`jobs/pingcap/tidb/release-6.5-20241101-v6.5.7/ghpr_check.groovy`).
* Added several other pipeline jobs (`ghpr_check2`, `ghpr_mysql_test`,
`ghpr_unit_test`, `pull_br_integration_test`, `pull_common_test`,
`pull_e2e_test`, `pull_integration_common_test`,
`pull_integration_copr_test`, `pull_integration_ddl_test`,
`pull_integration_jdbc_test`, `pull_integration_mysql_test`,
`pull_sqllogic_test`, `pull_tiflash_test`) with similar configurations.
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New pipeline job for `pingcap/tiflow`:

* Defined `ghpr_verify` pipeline job with log rotation, parameters,
properties, and SCM configuration
(`jobs/pingcap/tiflow/release-6.5-20241101-v6.5.7/ghpr_verify.groovy`).
 (commit: f4e712a)