Optimize the frontend CI workflow (#33269)

We're currently running way too many jobs on every single commit in CI.

Frontend code coverage is a good example.
We can safely move it to run only on the merge to master.

Experimental run showed that running FE unit tests without the coverage takes 22 minutes.
The run with the coverage takes ~33 minutes on the same machine.

Furthermore, we don't have to run Chromatic on every single run.
On merge to master should be more than enough.

.github/workflows/frontend.yml

@@ -38,8 +38,8 @@ jobs:
     - uses: actions/checkout@v3
     - name: Prepare front-end environment
       uses: ./.github/actions/prepare-frontend
-    - run: yarn run lint-prettier
-      name: Run Prettier formatting linter
+    - name: Run Prettier formatting linter
+      run: yarn run lint-prettier
 
   fe-linter-eslint:
     needs: files-changed
@@ -54,8 +54,8 @@ jobs:
       uses: ./.github/actions/prepare-backend
       with:
         m2-cache-key: 'cljs'
-    - run: yarn run lint-eslint
-      name: Run ESLint linter
+    - name: Run ESLint linter
+      run: yarn run lint-eslint
 
   fe-type-check:
     needs: files-changed
@@ -88,9 +88,14 @@ jobs:
       uses: ./.github/actions/prepare-backend
       with:
         m2-cache-key: 'cljs'
-    - run: yarn run test-unit --coverage --silent
-      name: Run frontend unit tests
+    - name: Run frontend unit tests and collect the code coverage information
+      if: github.ref_name == 'master'
+      run: yarn run test-unit --coverage --silent
+    - name: Run frontend unit tests
+      if: github.ref_name != 'master'
+      run: yarn run test-unit
     - name: Upload coverage to codecov.io
+      if: github.ref_name == 'master'
       uses: codecov/codecov-action@v3
       with:
         files: ./coverage/lcov.info
@@ -109,12 +114,12 @@ jobs:
       uses: ./.github/actions/prepare-backend
       with:
         m2-cache-key: 'cljs'
-    - run: yarn run test-timezones
-      name: Run frontend timezones tests
+    - name: Run frontend timezones tests
+      run: yarn run test-timezones
 
   fe-chromatic:
     needs: files-changed
-    if: github.event.pull_request.draft == false && needs.files-changed.outputs.frontend_all == 'true'
+    if: github.ref_name == 'master' && needs.files-changed.outputs.frontend_all == 'true'
     runs-on: ubuntu-22.04
     steps:
       - name: Checkout repository