ci: increase resources for CI jobs

In v18, RBE is not enabled, which causes tests to be slower. To compensate for this, the CI jobs are updated to use more powerful runners 'ubuntu-latest-16core' instead of 'ubuntu-latest'.

Author: alan-agius4

.github/workflows/ci.yml

@@ -54,7 +54,7 @@ jobs:
         run: yarn ng-dev release build
 
   test:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-latest-16core
     steps:
       - name: Initialize environment
         uses: angular/dev-infra/github-actions/npm/checkout-and-setup-node@b45dfa77df2021b23eeda5928ca6cd8bb89b21e7

.github/workflows/pr.yml

@@ -88,7 +88,7 @@ jobs:
           retention-days: 14
 
   test:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-latest-16core
     steps:
       - name: Initialize environment
         uses: angular/dev-infra/github-actions/npm/checkout-and-setup-node@b45dfa77df2021b23eeda5928ca6cd8bb89b21e7