Auto merge of #7217 - xFrednet:7172-metadata-collection-cargo-alias, r=flip1995

Add `cargo collect-metadata` as an cargo alias for the metadata collection lint

This PR adds a new alias to run the metadata collection monster on `clippy_lints`. I'm currently using it to create the `metadata_collection.json` file and I plan to use it in the `deply.sh` script. Having it as a new alias enables us to simply use:

```sh
cargo collect-metadata
```

It sometimes requires running `cargo clean` before collecting the metadata due to caching. I'm still debating if I should include a cargo clean as part of the `run_metadata_collection_lint` test or not. Input on this would be greatly appreciated :upside_down_face:

That's it, just a small change that can be reviewed and merged in parallel to #7214.

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See: #7172 for the full metadata collection to-do list or to suggest a new feature in connection to it.

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changelog: none

r? `@flip1995` btw. feel free to pass these PRs one to other team members as well if you want.

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