feat(spec): declare MetadataProtocol.historyMetaItem and de-cast the REST history door #27686

Job	Run time
filter	12s
Build Core	7m 37s
Dogfood Regression Gate (2/3)	9m 22s
Dogfood Verify CLI	5m 37s
Build Docs	5m 6s
Test Core (6/6)	11m 55s
Temporal Conformance (live PG + MySQL)	8m 13s
Test Core (2/6)	10m 9s
Test Core (5/6)	11m 4s
Test Core (3/6)	7m 4s
Test Core (1/6)	21m 14s
Test Core (4/6)	12m 25s
Dogfood Regression Gate (1/3)	9m 19s
Dogfood Regression Gate (3/3)	7m 35s
Console Pin Gate	0s
Dogfood Regression Gate	12s
Test Core	11s
	2h 7m 15s

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