[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

e2e/baseFixtures.js

@@ -81,7 +81,7 @@ exports.test = base.test.extend({
    * ```js
    * test.use({
    *   clockOptions: {
-   *       now: 0,
+   *       now: MISSION_TIME,
    *       shouldAdvanceTime: true
    * ```
    * If clockOptions are provided, will override the default clock with fake timers provided by SinonJS.