Add Visual Test for Snow Theme and add visual tests to PR execution (#5570)

e2e/tests/visual/controlledClock.visual.spec.js

@@ -25,27 +25,21 @@ Collection of Visual Tests set to run in a default context. The tests within thi
 are only meant to run against openmct's app.js started by `npm run start` within the
 `./e2e/playwright-visual.config.js` file.
 
-These should only use functional expect statements to verify assumptions about the state
-in a test and not for functional verification of correctness. Visual tests are not supposed
-to "fail" on assertions. Instead, they should be used to detect changes between builds or branches.
-
-Note: Larger testsuite sizes are OK due to the setup time associated with these tests.
 */
 
-const { test, expect } = require('../../baseFixtures.js');
+const { test, expect } = require('../../pluginFixtures');
 const percySnapshot = require('@percy/playwright');
 
-test.describe('Visual - Controlled Clock', () => {
+test.describe('Visual - Controlled Clock @localStorage', () => {
     test.use({
         storageState: './e2e/test-data/VisualTestData_storage.json',
         clockOptions: {
             now: 0, //Set browser clock to UNIX Epoch
-            shouldAdvanceTime: false, //Don't advance the clock
-            toFake: ["setTimeout", "nextTick"]
+            shouldAdvanceTime: false //Don't advance the clock
         }
     });
 
-    test('Overlay Plot Loading Indicator @localstorage', async ({ page }) => {
+    test('Overlay Plot Loading Indicator @localStorage', async ({ page, theme }) => {
         // Go to baseURL
         await page.goto('./#/browse/mine?hideTree=true', { waitUntil: 'networkidle' });
 
@@ -57,6 +51,6 @@ test.describe('Visual - Controlled Clock', () => {
         await page.locator('canvas >> nth=1').hover({trial: true});
 
         //Take snapshot of Sine Wave Generator within Overlay Plot
-        await percySnapshot(page, 'SineWaveInOverlayPlot');
+        await percySnapshot(page, `SineWaveInOverlayPlot (theme: '${theme}')`);
     });
 });