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feat(spec)!: a page action row's onSuccess is ActionSchema's own block, and its executor key refuses the 'navigation' alias #45299

Job	Run time
filter	19s
Test Core (4/6)	19m 22s
Test Core (6/6)	15m 49s
Build Docs	4m 28s
Build Core	5m 0s
Test Core (1/6)	18m 7s
Test Core (5/6)	19m 42s
Test Core (3/6)	31m 6s
Test Core (2/6)	16m 3s
Dogfood Regression Gate	10s
Dogfood Verify CLI	0s
Temporal Conformance (live PG + MySQL)	0s
Console Pin Gate	0s
Dogfood Regression Gate (${{ matrix.shard }}/3)	0s
Test Core	26s
	2h 10m 32s