server: make gc support multi-threads (tikv#16096) (tikv#16588)

close tikv#16101

do parallel region gc and expose the gc thread configuration. The configuration can be dynamically updated.

Signed-off-by: Qi Xu <[email protected]>

Co-authored-by: Qi Xu <[email protected]>
Co-authored-by: tonyxuqqi <[email protected]>

chore: bump version to v7.5.1 (tikv#16548)

Signed-off-by: lijie <[email protected]>

raftstore: Revert remove peer check (tikv#16479)

close tikv#16465

revert the remove peer check. Without this revert, the scale-in will be blocked when there're one slow or down peer in a region of the scale-in node.

Signed-off-by: tonyxuqqi <[email protected]>

config: Change titan min blob size default value to 32KB (tikv#16402) (…

…tikv#16413)

close tikv#16370

Change titan min blob size default value to 32KB

Signed-off-by: Connor1996 <[email protected]>

Co-authored-by: Connor1996 <[email protected]>

chore: bump version to v8.0.0-alpha (tikv#16333)

Signed-off-by: lijie <[email protected]>
Co-authored-by: Purelind <[email protected]>

cdc: add more metrics about output events queue time (tikv#16281) (ti…

…kv#16293)

close tikv#16282

Signed-off-by: qupeng <[email protected]>
Co-authored-by: qupeng <[email protected]>

chore: bump version to 6.5.7 (tikv#16254)

Signed-off-by: lijie <[email protected]>

*: set version to 6.5.6-fips (tikv#16199)

Signed-off-by: Neil Shen <[email protected]>

chore: bump version to 7.1.3 (tikv#16168)

Signed-off-by: lijie <[email protected]>

Revert "cdc: limit pending scan tasks (tikv#16048) (tikv#16054)" (tik…

…v#16157)

Signed-off-by: qupeng <[email protected]>