Remove ember-cli-dependency-checker

[NullVoxPopuli]

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fewer dependencies = better?

[wagenet]

I've found this package helpful in two scenarios recently:

1. I forgot to run pnpm install
2. I set an override in my package.json and forgot to update the actual specified dependency version to match.

[NullVoxPopuli]

I've added those scenarios to the RFC.

1. is mostly covered, I think? you get a pretty early error otherwise 2. there is another use case here where your dependencies are stale.
2. this is uncovered

maybe instead of removing this dependency across the board, we

• don't include it in embroider projects (webpack / vite tooling can check versions and probably provide better UI for seeing dep version mismatches -- i need to see if something for this already exists though -- because I feel like it should)
• move ember-cli-dependency-checker into the ember-cli org, and keep it for classic apps

[SergeAstapov]

+1 to callout from @wagenet as not once it helped to avoid mistakes by not running npm i/pnpm i