tidb-server v6.5.9

For new features, improvements, and bug fixes released in 6.5.9 for tidb-server, see TiDB 6.5.9 release notes.
See the difference from the issue perspective:

- pingcap/tidb#39349

• #50957

• #51051

• #49566, close #50850, close #50855

• #47594

• #48713

• #40192

• #48713

• #40937

• #50841

• #47656

• #48180

• #50942

• #50337

• #50878

• #50043, close #51324

• #51372

• #51528

• #51427

• #50854

• #51473

• #50839

• #40463

• #51581

• #51957

• #51370

• #51046

• #51962

• #47475

• #49423

• #51560

• #51448

• #50533

• #52049

• #49552

• #51107

• #51765

• #51596

• #51383

• #51762, close #51807

• #50613

• #50614

• #51301

• #51547

• #50803

• #50926

• #50810

• #50819

• #51572

• #51838

• #50757

• #52082

• #51873

• #48230

• #39664

• #41688

• #52255

• #51800