replication_mode: use placement to determin canSync and hasMajority (#7202)

[ti-chi-bot]

This is an automated cherry-pick of #7202

What problem does this PR solve?

Issue Number: Close #7201

What is changed and how does it work?

• determine canSync and hasMajority flags based on placement rule configuration.

Check List

Tests

• Unit test

Code changes

• Has the configuration change
  primary-replicas and dr-replicas configurations are not deprecated.

Related changes

• Need to cherry-pick to the release branch

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• CabinfeverB
• disksing

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[codecov]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Files	Coverage Δ
server/replication/replication_mode.go	82.16% <88.00%> (-0.65%)	⬇️

... and 17 files with indirect coverage changes

📢 Thoughts on this report? Let us know!.

[disksing]

/merge

[ti-chi-bot]

@disksing: It seems you want to merge this PR, I will help you trigger all the tests:

/run-all-tests

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[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: e348f3e

[nolouch]

/merge

[ti-chi-bot]

@nolouch: It seems you want to merge this PR, I will help you trigger all the tests:

/run-all-tests

You only need to trigger /merge once, and if the CI test fails, you just re-trigger the test that failed and the bot will merge the PR for you after the CI passes.

If you have any questions about the PR merge process, please refer to pr process.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the ti-community-infra/tichi repository.