Extract e2e job into separate workflow

RISDEV-0000
With the separation, the concurrency group is only applied on workflow level and not for each of the matrix e2e jobs individually.

.github/workflows/e2e_matrix.yml

@@ -0,0 +1,17 @@
+jobs:
+  e2e-matrix:
+    strategy:
+      fail-fast: false
+      matrix:
+        subproject: [ caselaw, shared ]
+        browser: [ chromium, firefox ]
+        mode: [ e2e ]
+        include:
+          - mode: a11y
+            browser: a11y
+    uses: ./.github/workflows/_playwright-test.yml
+    with:
+      subproject: ${{ matrix.subproject}}
+      browser: ${{ matrix.browser }}
+      mode: ${{ matrix.mode }}
+    secrets: inherit

.github/workflows/pipeline.yml

@@ -364,20 +364,8 @@ jobs:
       group: deploy-staging
       cancel-in-progress: true
     needs: [ deploy-staging, prep-playwright-tests ]
-    strategy:
-      fail-fast: false
-      matrix:
-        subproject: [ caselaw, shared ]
-        browser: [ chromium, firefox ]
-        mode: [ e2e ]
-        include:
-          - mode: a11y
-            browser: a11y
-    uses: ./.github/workflows/_playwright-test.yml
-    with:
-      subproject: ${{ matrix.subproject}}
-      browser: ${{ matrix.browser }}
-      mode: ${{ matrix.mode }}
+    # We do not include the matrix directly, so that the concurrency group does not apply to each matrix job individually
+    uses: ./.github/workflows/e2e_matrix.yml
     secrets: inherit
 
   query-performance-tests: