Replace "checking cached actions" message when no action is running.

While we delay the execution phase progress until we execution real actions (see unknown commit), with Skymeld we could still see the following scenario:
- Bazel completes the analysis for the first top-level target
- Bazel starts execution for the first top-level target, still analyzing other top-level targets
- Bazel completes execution for the first top-level target, still running analysis for other top-level targets

Prior to this CL, we would have reported something like `[42 / 42] checking cached actions` until we continue with execution (after the next top-level target finishes analysis). Now, we do report `[42 / 42] no actions running`.

RELNOTES: Improve progress message in case there are no actions in flight, and display explicitly "no actions running" in that case.
PiperOrigin-RevId: 661205481
Change-Id: Ieaf77090ecf3d4979330fcd8229a92afc98c7557

src/main/java/com/google/devtools/build/lib/buildtool/ExecutionProgressReceiver.java

@@ -242,4 +242,8 @@ public void maybeReportInactivity() {
       }
     };
   }
+
+  public boolean hasActionsInFlight() {
+    return completedActions.size() < exclusiveTestsCount + enqueuedActions.size();
+  }
 }

src/main/java/com/google/devtools/build/lib/runtime/UiStateTracker.java

@@ -1284,7 +1284,11 @@ protected void writeExecutionProgress(
     ActionState oldestAction = getOldestAction();
     if (actionsCount == 0 || oldestAction == null) {
       // TODO(b/239693084): Improve the message here.
-      terminalWriter.normal().append(" checking cached actions");
+      if (executionProgressReceiver != null && executionProgressReceiver.hasActionsInFlight()) {
+        terminalWriter.normal().append(" checking cached actions");
+      } else {
+        terminalWriter.normal().append(" no actions running");
+      }
       maybeShowRecentTest(terminalWriter, shortVersion, targetWidth - terminalWriter.getPosition());
     } else if (actionsCount == 1) {
       if (maybeShowRecentTest(null, shortVersion, targetWidth - terminalWriter.getPosition())) {