[CI] Stabilize visual tests, remove appAction, and update pane buttons (#7033)

* Add a VISUAL_URL constant and remove all vestiges of hide inspector and tree

* hide timer and add concurrency

* turn off concurrency

* factor out old appAction

* Add expand button to panes

* remove old slow annotations

* fix fault

* update domcontentloaded

* missed refactor

* driveby: setTimeBounds private

* add comments to the percyCSS

* suggest MISSION_TIME

* more notes

* regen

* clean up test

* driveby: clean up order

* restructure

* add new suite now that i'ts hidden

* use mission time everywhere possible

* driveby

* rerun generatedata

* comments

* lintfix

src/ui/layout/pane.vue

@@ -28,11 +28,17 @@
       <button
         v-if="isCollapsable"
         class="l-pane__collapse-button c-icon-button"
+        :name="collapseTitle"
         :title="collapseTitle"
         @click="toggleCollapse"
       ></button>
     </div>
-    <button class="l-pane__expand-button" @click="toggleCollapse">
+    <button
+      class="l-pane__expand-button"
+      :name="expandTitle"
+      :title="expandTitle"
+      @click="toggleCollapse"
+    >
       <span class="l-pane__expand-button__label">{{ label }}</span>
     </button>
     <div class="l-pane__contents">
@@ -81,6 +87,9 @@ export default {
     collapseTitle() {
       return `Collapse ${this.label} Pane`;
     },
+    expandTitle() {
+      return `Expand ${this.label} Pane`;
+    },
     localStorageKey() {
       if (!this.label) {
         return null;