Rollup of 6 pull requests
Successful merges:
- #116754 (coverage: Several small cleanups in `spans`)
- #116798 (Improve display of parallel jobs in rustdoc-gui tester script)
- #116800 (Fix implied outlives check for GAT in RPITIT)
- #116805 (Make `rustc_onunimplemented` export path agnostic)
- #116808 (Add myself to smir triage)
- #116811 (Preserve unicode escapes in format string literals when pretty-printing AST)
r? `@ghost`
`@rustbot` modify labels: rollup
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