Extend msg and description to work with any subcommand

Previously `description` only supported `Testing` and `Benchmarking`,
and `msg` gave weird results for `doc` (it would say `Docing`).

src/bootstrap/builder.rs

@@ -644,12 +644,16 @@ pub fn as_str(&self) -> &'static str {
         }
     }
 
-    pub fn test_description(&self) -> &'static str {
+    pub fn description(&self) -> String {
         match self {
             Kind::Test => "Testing",
             Kind::Bench => "Benchmarking",
-            _ => panic!("not a test command: {}!", self.as_str()),
+            Kind::Doc => "Documenting",
+            Kind::Run => "Running",
+            Kind::Suggest => "Suggesting",
+            _ => return format!("{self:?}"),
         }
+        .to_owned()
     }
 }
 

src/bootstrap/lib.rs

@@ -1020,8 +1020,8 @@ fn msg(
         host: impl Into<Option<TargetSelection>>,
         target: impl Into<Option<TargetSelection>>,
     ) -> Option<gha::Group> {
-        let action = action.into();
-        let msg = |fmt| format!("{action:?}ing stage{stage} {what}{fmt}");
+        let action = action.into().description();
+        let msg = |fmt| format!("{action} stage{stage} {what}{fmt}");
         let msg = if let Some(target) = target.into() {
             let host = host.into().unwrap();
             if host == target {

src/bootstrap/test.rs

@@ -101,7 +101,7 @@ fn run(self, builder: &Builder<'_>) {
         );
         builder.info(&format!(
             "{} {} stage0 ({})",
-            builder.kind.test_description(),
+            builder.kind.description(),
             path,
             bootstrap_host,
         ));