chore: use larger runner group rather than a single larger runner (#36216)

.github/workflows/studio-unit-tests.yml

@@ -26,7 +26,8 @@ permissions:
 jobs:
   test:
     # Uses larger hosted runner as it significantly decreases build times
-    runs-on: [larger-runner-4cpu]
+    runs-on:
+      group: Default Larger Runners
     strategy:
       matrix:
         test_number: [1]

.github/workflows/typecheck.yml

@@ -16,7 +16,8 @@ permissions:
 jobs:
   typecheck:
     # Uses larger hosted runner as it significantly decreases build times
-    runs-on: [larger-runner-4cpu]
+    runs-on:
+      group: Default Larger Runners
 
     steps:
       - name: Checkout