fix(ivy): content query results should be available in content hooks

[kara]

This PR ensures that content queries are refreshed before the ngAfterContentInit and ngAfterContentChecked hooks are called.

[mary-poppins]

You can preview 92fcd23 at https://pr25271-92fcd23.ngbuilds.io/.

[kara]

presubmit

[alfaproject]

If you are assigning null then might as well have the proper type instead of tricking the compiler: foo: QueryList<ElementRef> | null = null

[kara]

Eh, I'd rather put it up there than have to add a ! below.

[alfaproject]

That's the thing, you are lying about the type. foos can be null since that's what you are assigning to it.

But if you can be sure that this variable is always defined before use, then might as well leave the previous version since it conveys the right meaning.

[kara]

Fair enough, I think the original was better.

[mary-poppins]

You can preview 82c0525 at https://pr25271-82c0525.ngbuilds.io/.

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