Auto merge of #10638 - Muscraft:move-snapshot-tests, r=epage

Move snapshot tests into testsuite

This moves all tests from the `snapshot` folder into the `testsuite` folder as described by [this comment](https://github.com/rust-lang/cargo/pull/10631#discussion_r866306441). A macro was also added so there is no need to specify the path in a `snapshot` test just the file. This was done for ease of refactoring and ease of porting new tests to `snapshot`

close #10627

r? `@epage`