Fix #21939: Update names and descriptions for cc and setup phases (#21942)

Fix #21939

```
             preRecheck  preRecheck
                recheck  recheck
                ccSetup  prepare compilation unit for capture checking
                     cc  capture checking
```

Author: noti0na1

compiler/src/dotty/tools/dotc/cc/CheckCaptures.scala

@@ -28,6 +28,9 @@ import reporting.{trace, Message, OverrideError}
 object CheckCaptures:
   import ast.tpd.*
 
+  val name: String = "cc"
+  val description: String = "capture checking"
+
   enum EnvKind:
     case Regular        // normal case
     case NestedInOwner  // environment is a temporary one nested in the owner's environment,
@@ -192,7 +195,9 @@ class CheckCaptures extends Recheck, SymTransformer:
   import ast.tpd.*
   import CheckCaptures.*
 
-  def phaseName: String = "cc"
+  override def phaseName: String = CheckCaptures.name
+
+  override def description: String = CheckCaptures.description
 
   override def isRunnable(using Context) = super.isRunnable && Feature.ccEnabledSomewhere
 

compiler/src/dotty/tools/dotc/cc/Setup.scala

@@ -28,6 +28,9 @@ trait SetupAPI:
 
 object Setup:
 
+  val name: String = "ccSetup"
+  val description: String = "prepare compilation unit for capture checking"
+
   /** Recognizer for `res $throws exc`, returning `(res, exc)` in case of success */
   object throwsAlias:
     def unapply(tp: Type)(using Context): Option[(Type, Type)] = tp match
@@ -53,6 +56,10 @@ import Setup.*
 class Setup extends PreRecheck, SymTransformer, SetupAPI:
   thisPhase =>
 
+  override def phaseName: String = Setup.name
+
+  override def description: String = Setup.description
+
   override def isRunnable(using Context) =
     super.isRunnable && Feature.ccEnabledSomewhere