fix(state sync): delete get_cached_state_parts #7097

Job	Run time
Cargo Nextest (Linux)	15m 25s
Protobuf Backward Compatibility	10s
Backward Compatibility	11m 1s
Cargo Nextest (Linux Nightly)	15m 34s
Cargo Nextest (MacOS)	11m 37s
Database Migration	12m 2s
Genesis Changes	9m 23s
Sanity Checks	6m 18s
Style	36s
Upgradability	11m 7s
Cargo Audit	35s
Cargo Deny	39s
Cargo Clippy	8m 33s
Cargo Fmt	34s
Non-default Configuration Builds	1m 27s
Unused Dependencies	6m 48s
Themis	39s
Rust Doctests	11m 10s
Lychee Lints	15s
Windows check for building public libraries	4m 47s
Protocol Schema	14m 19s
Upload Coverage	23s
Generate Coverage Artifact (unit, unit)	2m 32s
Generate Coverage Artifact (integration, unit integration)	2m 51s
	2h 28m 45s

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