Include whitespace in "remove |" suggestion and make it hidden

[estebank]

Tweak error rendering of patterns with an extra | on either end.

Built on #137409. Only last commit is relevant.

? @compiler-errors

[rustbot]

r? @fee1-dead

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[rustbot]

Some changes occurred in match checking

cc @Nadrieril

Some changes occurred in src/tools/clippy

cc @rust-lang/clippy

[compiler-errors]

I believe this is still waiting on adding a tracking issue for majorly refactoring diagnostic suggestion styles that I asked for in #t-compiler/wg-diagnostics > Why are we making suggestions verbose? @ 💬

@rustbot author

[compiler-errors]

Why not make this tool-only? I don't think we need to remind users that they can remove something that we've already told them is invalid

[estebank]

Fair, changed.