refactor: downgrade `vm::get_key` span to the trace level #2447

Job	Run time
Protobuf Backward Compatibility	10s
Database Migration	10m 34s
Cargo Clippy	8m 6s
Cargo Deny	29s
Cargo Nextest (Linux)	18m 28s
Cargo Fmt	17s
Cargo Nextest (Linux StatelessNet)	18m 40s
Cargo Nextest (Linux Nightly)	18m 40s
Lychee Lints	7s
Backward Compatibility	10m 46s
Cargo Nextest (MacOS)	11m 7s
Sanity Checks	5m 57s
Genesis Changes	11m 37s
Style	39s
Upgradability	11m 10s
RPC Schema	11m 23s
Cargo Audit	15s
Non-default Configuration Builds	1m 18s
Themis	35s
Unused Dependencies	6m 44s
Upload Coverage	25s
Generate Coverage Artifact (unit, unit)	5m 54s
Generate Coverage Artifact (integration, unit integration)	4m 35s
	2h 37m 56s

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