[Storybook] Consolidate se23 feature toggles (#10242)

### WHY are these changes introduced?
Part of #10191

<img width="1276" alt="Screenshot 2023-08-25 at 1 28 07 PM"
src="https://github.com/Shopify/polaris/assets/20652326/9e245dd7-ebab-4225-92c7-4438f2f986e2">

### WHAT is this pull request doing?

- Delete`.github/workflows/ci-a11y-vrt.yml`
- Rename `.github/workflows/ci-a11y-vrt-experimental.yml` to
`.github/workflows/ci-a11y-vrt.yml`
- Removes feature toggles from storybook

> Note: I kept the panel and features object so that we can easily add
them back in the future

### Tophat
- Make sure storybook on the PR is with the feature flag on
- Make sure the toggles are not there anymore
- Make sure there isn't an experimental Accessibility and visual
regression check anymore and that CI passes

.github/workflows/ci-a11y-vrt.yml

@@ -8,11 +8,13 @@ on:
     paths:
       - 'polaris-react/src/**'
       - 'polaris-react/playground/**'
+      - 'polaris-react/.storybook/**'
       - 'polaris-tokens/src/**'
   pull_request:
     paths:
       - 'polaris-react/src/**'
       - 'polaris-react/playground/**'
+      - 'polaris-react/.storybook/**'
       - 'polaris-tokens/src/**'
 
 jobs:
@@ -45,9 +47,9 @@ jobs:
             **/.turbo
             node_modules/.cache/turbo
             polaris-react/build-internal/cache
-          key: ${{ runner.os }}-accessibility-test-v1-${{ github.sha }}
+          key: ${{ runner.os }}-accessibility-test-v2-${{ github.sha }}
           restore-keys: |
-            ${{ runner.os }}-accessibility-test-v1-
+            ${{ runner.os }}-accessibility-test-v2-
 
       - name: Install dependencies
         run: yarn --frozen-lockfile
@@ -85,9 +87,9 @@ jobs:
             **/.turbo
             node_modules/.cache/turbo
             polaris-react/build-internal/cache
-          key: ${{ runner.os }}-visual-regression-test-v1-${{ github.sha }}
+          key: ${{ runner.os }}-visual-regression-test-v2-${{ github.sha }}
           restore-keys: |
-            ${{ runner.os }}-visual-regression-test-v1-
+            ${{ runner.os }}-visual-regression-test-v2-
 
       - name: Install dependencies
         run: yarn --frozen-lockfile

polaris-react/.storybook/manager.js

@@ -71,20 +71,7 @@ addons.register('polaris/global-controls', () => {
   });
 });
 
-export const featureFlagOptions = {
-  polarisSummerEditions2023: {
-    name: 'polarisSummerEditions2023',
-    description: 'Toggle the summer editions feature flag',
-    defaultValue: true,
-    control: {type: 'boolean'},
-  },
-  polarisSummerEditions2023ShadowBevelOptOut: {
-    name: 'polarisSummerEditions2023ShadowBevelOptOut',
-    description: 'Toggle the shadow-bevel opt out feature flag',
-    defaultValue: false,
-    control: {type: 'boolean'},
-  },
-};
+export const featureFlagOptions = {};
 
 export const gridOptions = {
   showGrid: {

polaris-react/.storybook/preview.js

@@ -25,21 +25,12 @@ function AppProviderDecorator(Story, context) {
     document.getElementById('inter-font-link').removeAttribute('href');
   }
 
-  const {
-    polarisSummerEditions2023,
-    polarisSummerEditions2023ShadowBevelOptOut,
-  } = context.globals;
-
   if (context.args.omitAppProvider) return <Story {...context} />;
 
   return (
     <AppProvider
       features={{
-        polarisSummerEditions2023:
-          process.env.STORYBOOK_SE23 === 'on'
-            ? true
-            : polarisSummerEditions2023,
-        polarisSummerEditions2023ShadowBevelOptOut,
+        polarisSummerEditions2023: true,
       }}
       i18n={enTranslations}
     >