feat(components/pages): add `helpKey` input to the page component #11960

Job	Run time
Install and cache dependencies	13s
Build, code coverage unit tests, and linting	2m 27s
Bootup Nx Cloud agent (1)	2m 29s
Bootup Nx Cloud agent (2)	2m 31s
Build packages distribution	0s
Bootup Nx Cloud agent (3)	2m 32s
Check dependencies and resources	1m 27s
Check formatting	17s
Code coverage	1s
Lint	1s
Stop Nx Cloud agents	7s
Build	1s
	12m 6s

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