Refactor some old pipelines.

[purelind]

Some old pipelines currently the logic of writing is too complex. It needs to be refactored to improve maintainability and stablity.

Goals

• [x] pingcap/tidb presubmit

• [x] pingcap/tidb postsubmit

• [x] pingcap/tidb-engine-ext presubmit

  1. master https://github.com/PingCAP-QE/ci/pull/2703
  2. release-6.x https://github.com/PingCAP-QE/ci/pull/2703

• [ ] pingcap/tiflash presubmit

  • [x] master
  • [x] release-8.1
  • [ ] #3333
  • [x] release-6.5
  • [x] release-7.1
  • [x] release-7.5

• [ ] tikv/tikv presubmit

  • [x] master
  • [x] release-8.1
  • [ ] #3334
  • [x] release-6.5
  • [x] release-7.1
  • [x] release-7.5

• [x] tikv/migration presubmit

  1. main https://github.com/PingCAP-QE/ci/pull/2704

• [x] pingcap/docs and pingcap/docs-cn postsubmit

  1. master
  2. release-6.1
  3. release-6.5
  4. release-7.1
  5. release-7.5

• [x] pingcap/docs and pingcap/docs-cn presubmit

  1. master
  2. release-6.1
  3. release-6.5
  4. release-7.1
  5. release-7.5

• [x] pingcap/tidb-tools presubmit

  1. master https://github.com/PingCAP-QE/ci/pull/3003

[wuhuizuo]

We should split it in serval issues by repo.