feat(multiple): add ng-update entry for google-maps and youtube-player package

[devversion]

Currently if developers run ng update without specifying a package,
the CLI will analyze the current workspace and find packages that
provide migrations and need to be updated. For the youtube-player
and google-maps package we do not provide any migrations, so
ng update will not report this package.

Since these packages are part of the @angular scope, we
want these packages to be highlighted when users run ng update.
There aren't any migrations for these packages yet, but we are setting
up the integration with ng update in order to make these packages
visible to the CLI.

Fixes #22689.

[devversion]

@jelbourn This brings up the question: How to implement update migrations (if any needed in the future) if we don't have a dependency on the CDK for these packages. The CDK currently provides the common utilities for writing update schematics.

[Splaktar]

@devversion it almost seems like we need a separate @angular/schematic-tools repository for storing these common utilities 😉

[Splaktar]

LGTM. It would certainly be expected for these packages to show up in the output of ng update if they are out of date.

[devversion]

@devversion it almost seems like we need a separate @angular/schematic-tools repository for storing these common utilities 😉

Oh yeah 😄 I've been wanting something like this for a long time. I've built a lot of tooling around ng-update here and in framework. It would be great to avoid duplication here.

IIRC the tooling team is currently evaluating which tools would be candidates for a common utility package. I'm not sure how well our ng update infrastructure would fit though.

[jelbourn]

LGTM

[crisbeto]

LGTM

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