Revert "docs(material/table): use declarative idiomatic RxJS in table-http-example"

[andrewseguin]

Reverts #22053

The change produced a ExpressionChangedAfterItHasBeenCheckedError because it is setting a template value in ngAfterViewInit.

It's difficult to produce an example for this without subscribe because we need to wait until after the view is set up to retrieve the values we need to provide to the table.

[crisbeto]

LGTM

[Splaktar]

The change produced a ExpressionChangedAfterItHasBeenCheckedError because it is setting a template value in ngAfterViewInit.

Is there an associated issue or reproduction?

[crisbeto]

You can see it locally in the dev app. It won't happen in the docs, because they're run in production mode.

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