feat(resharding): delay split shard of flat store until resharding block is final #8123

Job	Run time
Protobuf Backward Compatibility	9s
Cargo Nextest (Linux)	15m 28s
Backward Compatibility	10m 41s
Cargo Nextest (Linux Nightly)	15m 49s
Database Migration	11m 53s
Cargo Nextest (MacOS)	11m 52s
Cargo Deny	32s
Cargo Audit	19s
Cargo Clippy	9m 33s
Cargo Fmt	24s
Non-default Configuration Builds	1m 24s
Unused Dependencies	11m 35s
Rust Doctests	11m 18s
Protocol Schema	14m 1s
Genesis Changes	10m 1s
Themis	42s
Sanity Checks	6m 13s
Style	36s
Upgradability	11m 30s
Windows check for building public libraries	5m 24s
Upload Coverage	32s
Generate Coverage Artifact (unit, unit)	2m 13s
Generate Coverage Artifact (integration, unit integration)	2m 55s
	2h 35m 4s

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