grpc-js: Improve formatting of channelz logs for grpcdebug

Author: murgatroid99

packages/grpc-js/src/internal-channel.ts

@@ -477,9 +477,7 @@ export class InternalChannel {
     if (this.channelzEnabled) {
       this.channelzTrace.addTrace(
         'CT_INFO',
-        ConnectivityState[this.connectivityState] +
-          ' -> ' +
-          ConnectivityState[newState]
+        'Connectivity state change to ' + ConnectivityState[newState]
       );
     }
     this.connectivityState = newState;

packages/grpc-js/src/subchannel.ts

@@ -277,9 +277,7 @@ export class Subchannel {
     if (this.channelzEnabled) {
       this.channelzTrace.addTrace(
         'CT_INFO',
-        ConnectivityState[this.connectivityState] +
-          ' -> ' +
-          ConnectivityState[newState]
+        'Connectivity state change to ' + ConnectivityState[newState]
       );
     }
     const previousState = this.connectivityState;