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:

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]

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[ti-chi-bot]

@ti-chi-bot: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
idc-jenkins-ci/build	42c19a8	link	true	/test build

Full PR test history. Your PR dashboard.

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[TonsnakeLin]

Could you please resolve the cp conflict? @disksing