WS-797: Polishing QA process

Changes

Back-end

• Added new determine_state method to CapabilityRequest that will determine request state automatically, based on the state of its versions
• Capability execution state transitions now occur before the action is performed, so effectively the action is performed from the next state

UI

• "Submit" button now appears based on the state of the selected version rather than the state of the request
• The request's latest version is now selected by default in the dropdown
• Removed extraneous QA-pass button

Completes WS-798 and WS-801

apps/web/src/app/workspaces/components/capability-request/capability-request.component.html

@@ -62,16 +62,6 @@
             "
           >
             <span id="qa-label">QA Processing: </span>
-            <button
-              id="set-qa-pass"
-              type="button"
-              class="btn btn-success"
-              (click)="passQa(this.capabilityExecution.current_workflow_request_id)"
-            >
-              <span class="fas fa-image"></span>
-              <span class="p1-2">Pass QA</span>
-            </button>
-
             <div class="btn-group">
               <div id="pass-button">
                 <button