[DNM] Fix resolved ts

[HuSharp]

What problem does this PR solve?

Issue Number: Close #xxx

What is changed and how does it work?

Check List

Tests

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

Code changes

• Has the configuration change
• Has HTTP API interfaces changed (Don't forget to add the declarative for the new API)
• Has persistent data change

Side effects

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

Related changes

• PR to update pingcap/docs/pingcap/docs-cn:
• PR to update pingcap/tiup:
• Need to cherry-pick to the release branch

Release note

None.

[ti-chi-bot]

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Adding the do-not-merge/cherry-pick-not-approved label.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Files	Coverage Δ
server/config/config.go	78.99% <ø> (ø)
server/core/store.go	80.55% <100.00%> (ø)

... and 29 files with indirect coverage changes

📢 Thoughts on this report? Let us know!.

[overvenus]

Suggested change

	func IsAvailableForMinResolvedTS(s *StoreInfo, state string) bool {
	if state == "sync_recover" {
	return !s.IsRemoved() && !s.IsTiFlash()
	}
	// If a store is tombstone or no leader, it is not meaningful for min resolved ts.
	// And we will skip tiflash, because it does not report min resolved ts.
	return !s.IsRemoved() && !s.IsTiFlash() && s.GetLeaderCount() != 0
	func IsAvailableForMinResolvedTS(s *StoreInfo, state string) bool {
	// If a store is tombstone or no leader, it is not meaningful for min resolved ts.
	// And we will skip tiflash, because it does not report min resolved ts.
	return !s.IsRemoved() && !s.IsTiFlash()

[rleungx]

dr doesn't use flashback, this PR is no longer needed.