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feat(plugin-timeline): declare `navigation` on object-timeline, by reference to the spec (objectui#8654) #21388

Job	Run time
Test (dist pins)	1m 30s
Build Docs	2m 34s
Changeset Fixed Group Check	9s
Test (shard 6/8)	12m 7s
Type Check	7m 16s
Build & E2E	1m 9s
Test (shard 3/8)	11m 45s
Test (shard 4/8)	12m 55s
Test (shard 1/8)	14m 17s
Test (shard 2/8)	9m 50s
Test (shard 7/8)	9m 12s
Test (shard 8/8)	12m 3s
Test (shard 5/8)	12m 38s
Test (coverage shard ${{ matrix.shard }}/4)	0s
Test (coverage)	0s
Test	9s
	1h 47m 34s