fix(21943): remove duplicate lints

[jdrouet]

In this PR, I filter the lints that have already been added by name.
There are 2 main groups, the default lints and the rustdoc lints.
This should avoid having duplicates.

Fixes #21943

PS: I've tried regenerating the lints, it introduced many changes which are not really related, so I manually removed them instead.

[ChayimFriedman2]

Using a hashmap for deduplication, especially with the default hasher but not only, risks ordering changes across runs. Instead, sort and dedup().

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[jdrouet]

Using a hashmap for deduplication, especially with the default hasher but not only, risks ordering changes across runs. Instead, sort and dedup().

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Thanks for your answer, but I'm not sure I understand properly.
As you said, the HashSet is only used for deduplication, so, as long as we don't change the order of the values in the Vec, the result will be the same considering we only call .contains 🤔 The hasher is not involved in this, is it?

Thanks in advance 😉

[ChayimFriedman2]

Right, my mistake (I thought the deduplication is also inside lints and groups, not just between lints and groups). But please remove the test.

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[ChayimFriedman2]

Please squash, then LGTM.

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[jdrouet]

One commit is probably enough for this 😉 done!

[ShoyuVanilla]

Thanks!

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