chore(canary): disable React RTL canary environment deployments (#11129)

### Related Ticket(s)

N/A

### Description

`deploy-canary` deployments have been failing specifically for React RTL. The complaint appears to be around the postcss plugin version being used. However, with the deprecation of the React package and this environment has been strictly for internal team usage, this PR will instead be disabling this canary deployment specifically for React RTL.

### Changelog

**Changed**

- `deploy-canary.yml` => removal of React RTL deployments

.github/workflows/deploy-canary.yml

@@ -118,22 +118,6 @@ jobs:
           rm packages/react/.env
           mv packages/react/storybook-static-experimental builds/react-experimental
 
-      - name: Set env vars (RTL)
-        uses: ./.github/actions/set-dotenv
-        with:
-          env-file: packages/react/.env
-        env:
-          KALTURA_PARTNER_ID: ${{ secrets.KALTURA_PARTNER_ID }}
-          KALTURA_UICONF_ID: ${{ secrets.KALTURA_UICONF_ID }}
-          PROFILE_HOST: ${{ secrets.PROFILE_HOST }}
-      - name: Building @carbon/ibmdotcom-react (RTL) storybook
-        run: yarn build-storybook:rtl
-        working-directory: packages/react
-      - name: Move storybook to build folder
-        run: |
-          rm packages/react/.env
-          mv packages/react/storybook-static-rtl builds/react-rtl
-
       - name: Deploying @carbon/ibmdotcom-react storybook to Github Pages
         run: |
           git config --global user.email ${{ secrets.BOT_EMAIL }}
@@ -146,14 +130,11 @@ jobs:
 
           rm -rf canary/react
           rm -rf canary/react-experimental
-          rm -rf canary/react-rtl
           mkdir -p canary
           mv builds/react canary/react
           mv builds/react-experimental canary/react-experimental
-          mv builds/react-rtl canary/react-rtl
 
           git add canary/react
-          git add canary/react-rtl
           git add canary/react-experimental
           git commit -m "chore(deploy): deploy React canary to GitHub Pages"
           git push origin gh-pages