Render more actions on change view

There are more actions that don't require additional input and can be
rendered already now:

* Delete draft change
* Delete draft revision
* Publish draft revision

Also align the primary button to the right side of the container to even
more visually emphasize, that this button does something different in
this specific change context, except blue color.

Status of the current revision is currently not correctly computed,
because the current code only respects the change.status field in the
change/revision status calculation. When cange.status is NEW, then the
revision draft field must be read to correctly render draft revision
status. This will be fixed in follow-up change.

Test Plan:

- Add draft change. Confirm that Publish and Delete buttons are visible
  and work as exptected
- Add draft revision. Confirm that Publish and Delete buttons are
  visible and work as exptected

Bug: Issue 3906
Change-Id: I9db90142088e165cf65b89abbe11a3d1dc6db634

gerrit-server/src/main/java/com/google/gerrit/server/change/DeleteDraftChange.java

@@ -72,6 +72,7 @@ public class DeleteDraftChange implements
   public UiAction.Description getDescription(ChangeResource rsrc) {
     try {
       return new UiAction.Description()
+        .setLabel("Delete")
         .setTitle("Delete draft change " + rsrc.getId())
         .setVisible(allowDrafts
             && rsrc.getChange().getStatus() == Status.DRAFT

gerrit-server/src/main/java/com/google/gerrit/server/change/DeleteDraftPatchSet.java

@@ -184,6 +184,7 @@ public class DeleteDraftPatchSet implements RestModifyView<RevisionResource, Inp
     try {
       int psCount = psUtil.byChange(db.get(), rsrc.getNotes()).size();
       return new UiAction.Description()
+        .setLabel("Delete")
         .setTitle(String.format("Delete draft revision %d",
             rsrc.getPatchSet().getPatchSetId()))
         .setVisible(allowDrafts

gerrit-server/src/main/java/com/google/gerrit/server/change/PublishDraftPatchSet.java

@@ -126,6 +126,7 @@ public class PublishDraftPatchSet implements RestModifyView<RevisionResource, In
   public UiAction.Description getDescription(RevisionResource rsrc) {
     try {
       return new UiAction.Description()
+        .setLabel("Publish")
         .setTitle(String.format("Publish revision %d",
             rsrc.getPatchSet().getPatchSetId()))
         .setVisible(rsrc.getPatchSet().isDraft()