Revert "feat(br): enable condition trigger of br test on 8.1"

[purelind]

Reverts #3332

Some br tests have failed; automatic triggering will be enabled after the tests are fixed.

test link:

1. https://do.pingcap.net/jenkins/blue/organizations/jenkins/pingcap%2Ftidb%2Frelease-8.1%2Fpull_br_integration_test/detail/pull_br_integration_test/29/pipeline/241

[ti-chi-bot]

I have already done a preliminary review for you, and I hope to help you do a better job.

Based on the pull request title and description, it seems that the changes made in the previous pull request have caused some test failures. Therefore, this pull request reverts those changes and disables automatic triggering until the tests are fixed.

The diff shows that the changes made in the previous pull request are being reverted in the release-8.1-presubmits.yaml file. In this file, the run_if_changed field is being changed to always_run: false and optional: true. Additionally, the skip_report field is being set to false.

As a reviewer, I would suggest checking the test failures that caused the revert and ensuring that all tests are passing before enabling automatic triggering again. Additionally, it may be helpful to provide more information on the specific test failures and what steps are being taken to fix them.

Regarding the changes in the diff, I would suggest double-checking with the developer why the optional: true field is being added. If it is necessary, then it should be documented clearly why it is being added. Otherwise, it may be better to remove it to avoid any confusion.

Overall, this pull request seems okay, but it would be helpful to have more context on the test failures and what steps are being taken to address them.

[purelind]

/cc @BornChanger

[ti-chi-bot]

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