Rollup merge of #139106 - ShE3py:pp-highlighting, r=compiler-errors

Mark .pp files as Rust

Pretty-printing tests generate `.pp` files, but GitHub classify and highlight them as Pascal:
[https://github.com/search?q=repo:rust-lang/rust+path:*.pp&type=code](https://github.com/search?q=repo%3Arust-lang%2Frust+path%3A*.pp&type=code)

``@rustbot`` label +A-meta +A-testsuite
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Matthias Krüger 2025-03-29 21:08:14 +01:00 committed by GitHub
commit f2d99f30a0
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