Revert vistest (#7559)

Revert the `/vistest` workflow until we can resolve the Chromatic action
not triggering for the `issue_comment` event.

Current workflow error:
```
Error: issue_comment event is not supported in this action 
```

Referenced issue feature request:
chromaui/chromatic-cli#668

Author: sam-b-rose

.github/CONTRIBUTING.md

@@ -155,7 +155,6 @@ We recommend running tests as well as trying your build of a package in a real p
 
 - `yarn test` will run tests for all packages
 - `yarn turbo run test --filter="[HEAD^1]"` will test any package that has changed in the last commit
-- Run visual testing via adding the `/vistest` comment in a PR
 
 You can test your changes in another project locally by creating a [snapshot release](https://github.com/Shopify/polaris/blob/main/documentation/Releasing.md#snapshot-release).
 

.github/workflows/vistest.yml renamed to .github/workflows/ci-a11y-vrt.yml

@@ -1,53 +1,63 @@
-name: Visual Regression Tests
+name: Accessibility and Visual Regression Tests
 
 on:
-  issue_comment:
-    types:
-      - created
+  push:
+    branches:
+      - main
+      - next
+    paths:
+      - 'polaris-react/src/**'
+      - 'polaris-react/playground/**'
+      - 'polaris-tokens/src/**'
+  pull_request:
+    paths:
+      - 'polaris-react/src/**'
+      - 'polaris-react/playground/**'
+      - 'polaris-tokens/src/**'
 
 jobs:
-  visual_regression_test:
-    name: 'Visual regression test'
-    if: |
-      github.event.issue.pull_request && github.event.comment.body == '/vistest'
+  accessibility_test:
+    name: 'Accessibility test'
     runs-on: ubuntu-latest
     steps:
-      - name: Enforce permission requirement
-        uses: prince-chrismc/check-actor-permissions-action@v1
+      - name: Checkout branch
+        uses: actions/checkout@v3
+
+      - name: Setup Node with v16.13.0
+        uses: actions/setup-node@v3
         with:
-          permission: write
+          node-version: 16.13.0
+          cache: yarn
 
-      - name: Validate pull request is not on forked repo
-        uses: actions/github-script@v6
-        id: pr_data
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      - name: Restore cache
+        uses: actions/cache@v3
         with:
-          script: |
-            try {
-              const pullRequest = await github.rest.pulls.get({
-                owner: context.repo.owner,
-                repo: context.repo.repo,
-                pull_number: context.issue.number,
-              })
+          path: |
+            **/.turbo
+            node_modules/.cache/turbo
+            polaris-react/build-internal/cache
+          key: ${{ runner.os }}-accessibility-test-v1-${{ github.sha }}
+          restore-keys: |
+            ${{ runner.os }}-accessibility-test-v1-
 
-              // Pull request from fork
-              if (context.payload.repository.full_name !== pullRequest.data.head.repo.full_name) {
-                const errorMessage = '`/vistest` is not supported on pull requests from forked repositories.'
+      - name: Install dependencies
+        run: yarn --frozen-lockfile
+
+      - name: Build packages
+        run: yarn turbo run build --filter=@shopify/polaris
 
-                await github.rest.issues.createComment({
-                  issue_number: context.issue.number,
-                  owner: context.repo.owner,
-                  repo: context.repo.repo,
-                  body: errorMessage,
-                })
+      - name: Build Storybook
+        run: yarn workspace @shopify/polaris run storybook:build --quiet
 
-                core.setFailed(errorMessage)
-              }
-            } catch (err) {
-              core.setFailed(`Request failed with error ${err}`)
-            }
+      - name: Run accessibility test
+        run: node ./polaris-react/scripts/accessibility-check.js
+        env:
+          STORYBOOK_DISABLE_DOCS: 1
 
+  visual_regression_test:
+    name: 'Visual regression test'
+    runs-on: ubuntu-latest
+    steps:
       - name: Checkout branch
         uses: actions/checkout@v3
         with: