Rollup merge of #125159 - fmease:allow-unauth-labels-l-pg-z, r=jieyouxu

Meta: Allow unauthenticated users to modify `L-*`, `PG-*` and `-Z*` labels

Complements: rust-lang/rust-forge#744.

1. `L-*`: Issues and PRs concerning specific lints
2. `PG-*`: Issues and PRs concerning specific project groups
3. `-Z*`: Issues and PRs concerning specific unstable `-Z` compiler options

These are safe to expose. Allows unauthenticated users greater leeway in triaging issues.
We have a lot of such people <3 and I want to support them as much as possible.

r? jieyouxu (you get assigned a lot these days :P) or compiler

triagebot.toml

@@ -9,11 +9,14 @@ allow-unauthenticated = [
     "E-*",
     "F-*",
     "I-*",
+    "L-*",
     "NLL-*",
     "O-*",
+    "PG-*",
     "S-*",
     "T-*",
     "WG-*",
+    "-Z*",
     "beta-nominated",
     "const-hack",
     "llvm-*",