Feature Request

Is your feature request related to a problem? Please describe:

Describe the feature you'd like:

• Clean internal service links for preparation about open source TiFlash repo renaming and open source preparation #4019.

Describe alternatives you've considered:

Teachability, Documentation, Adoption, Migration Strategy:

• Under https://github.com/pingcap/tics/tree/master/release-centos7-llvm/scripts, to remove:
  • build-tiflash-ci.sh
  • build-tiflash-ut-coverage.sh
  • fetch-ci-build.sh
  • tiflash-ci-prepare.sh
  • tiflash-ci-finish.sh
  • tiflash-ut-coverage-prepare.sh
  • tiflash-ut-coverage-finish.sh
  • upload-ci-build.sh
  • upload-ut-coverage.sh
  • release-centos7-llvm/scripts/env.sh#L1-L2 Clean useless processes and scripts #4153
• Remove
  • https://github.com/pingcap/tics/tree/master/.ci
  • https://github.com/pingcap/tics/tree/master/deprecated/release-centos7