Auto merge of #10853 - MarcusGrass:fix-from-over-into-self, r=Alexendoo

Ignore fix for `from_over_into` if the target type contains a `Self` reference

Fixes https://github.com/rust-lang/rust-clippy/issues/10838.

This is my first time contributing here, and the fix is kind of ugly.
I've worked a bit with `quote` and was trying to figure out a way to replace the type in a better way than just a raw string-replace but couldn't quite figure out how to.

The only thing really required to fix this, is to replace all `Self` references with the type stated in the `from` variable, this isn't entirely simple to do with raw strings without creating a mess though.

We need to find and replace all `Self`'s in a variable with `from` but there could be an arbitrary amount, in a lot of different positions. As well as some type that contains the name self, like `SelfVarSelf` which shouldn't be replaced.

The strategy is essentially, if `"Self"` is surrounded on both sides by something that isn't alphanumeric, then we're golden, then trying to make that reasonably efficient.

I would not be offended if the solution is too messy to accept!

changelog: [from_over_into]: Replace Self with the indicated variable in suggestion and fix.

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