Auto merge of #6650 - daxpedda:cargo-common-metadata-publish, r=flip1995

Fix cargo_common_metadata warning on `publish = false`.

I believe `cargo_common_metadata` shouldn't trigger when `publish = false`, not sure if everybody agrees.
Made some tests to handle all edge-cases.

Fixes #6649.

changelog: [`cargo_common_metadata`](https://rust-lang.github.io/rust-clippy/master/index.html#cargo_common_metadata): No longer lints if [`publish = false`](https://doc.rust-lang.org/cargo/reference/manifest.html#the-publish-field) is defined in the manifest

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