Add tidy check to ensure that rustdoc GUI tests start with a small description #106888
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The first commit comes from #106865 to prevent CI to fail.
This PR adds a tidy check to enforce having a small description at the top of the GUI test. Although the format is made to be as easy as possible to read, it's not always obvious what a test is actually checking. I think enforcing this will make it easier for us to come back on these tests if needed.
r? @notriddle