chore: extend e2e tests' timeout (#1106)

Author: czeslavo

.github/workflows/release-testing.yaml

@@ -86,7 +86,7 @@ jobs:
         TEST_RUN: ${{ matrix.test }}
 
   e2e-tests:
-    timeout-minutes: ${{ fromJSON(vars.GHA_DEFAULT_TIMEOUT) }}
+    timeout-minutes: 30 # Setting up a GKE cluster and getting a LB ready can take more than the default 10m.
     environment: gcloud
     runs-on: ubuntu-latest
     steps: