[Tracking] Minimize usages to `@angular-devkit/core`

[devversion]

According to a few discussions, we'd like to minimize usages to @angular-devkit/core. Especially the json.JsonObject doesn't necessarily help a lot with type safety. See linked PR:

I'd like to minimize the core package usage as much as possible here. I think this is as far as possible right now. Assuming it works with the other changes.

Originally posted by @clydin in #29349 (comment)

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