Expose preferred locations config

[shiyuhang0]

What problem does this PR solve?

What is changed and how it works?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Code changes

• Has exported function/method change
• Has exported variable/fields change
• Has interface methods change
• Has persistent data change

Side effects

• Possible performance regression
• Increased code complexity
• Breaking backward compatibility

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation
• Need to update the tidb-ansible repository
• Need to be included in the release note

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[shiyuhang0]

/run-all-tests

[shiyuhang0]

/run-all-tests

[shiyuhang0]

/run-all-tests

[shiyuhang0]

/run-all-tests tikv=v6.5.0 tidb=v6.5.0 pd=v6.5.0

[shiyuhang0]

/run-all-tests tidb=v6.1.0 tikv=v6.1.0 pd=v6.1.0

[shiyuhang0]

/run-all-tests

[shiyuhang0]

/run-all-tests tidb=v7.1.0 tikv=v7.1.0 pd=v7.1.0

[shiyuhang0]

/run-all-tests

[shiyuhang0]

/run-all-tests

[shiyuhang0]

/run-all-tests

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch master: #2765.

[shiyuhang0]

/cherry-pick master

[ti-chi-bot]

@shiyuhang0: new pull request could not be created: failed to create pull request against pingcap/tispark#master from head ti-chi-bot:cherry-pick-2762-to-master: status code 422 not one of [201], body: {"message":"Validation Failed","errors":[{"resource":"PullRequest","code":"custom","message":"A pull request already exists for ti-chi-bot:cherry-pick-2762-to-master."}],"documentation_url":"https://docs.github.com/rest/pulls/pulls#create-a-pull-request"}

In response to this:

/cherry-pick master

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