build: add packageGroup to CDK

[crisbeto]

Adds a packageGroup to the package.json of the CDK to avoid some warnings during ng update.

Fixes #30464.

[devversion]

This means ng update @angular/cdk will update Material too. Is this intended?

[crisbeto]

Yeah I think we'd want that in general given that we require the exact same version of CDK as Material in the peerDependencies.

[devversion]

Sounds good. I think the previous behavior is more correct, but this is also reasonable and probably more "convenient".

[crisbeto]

The changes were merged into the following branches: main, 19.1.x

[rubiesonthesky]

I think this has unwanted consequences: angular/angular-cli#29627

[crisbeto]

This was a recommendation from Tooling: #30464 (comment)

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