ci(pull-requests): drop 3x retry on Run E2E + Install Cozystack

Audit of 30 successful PR runs found that across 5 sampled failure
attempts, **25/25 retries** on `Run E2E tests` failed — the retry
loop never recovered a flake, only stretched deterministic failures
and tripled diagnostic wall-time. Same data shape on `Install
Cozystack`. Drop both.

`Prepare environment` keeps its 3x retry — that step is pure
infrastructure (Talos image download, sandbox VM boot, network)
where transient runner hiccups warrant a retry.

On failure, the test step now captures `kubectl get hr -A -o wide`
and `kubectl get events -A` under a collapsible group so triage
starts with the actual broken-state snapshot.

Depends on:
- #2508 — installer namespace bootstrap (Helm namespace-ownership conflict)
- #2509 — operator HelmRelease config knobs (`seaweedfs-system` 2-min wait race)
- #2528 — harbor bucket-secret + BucketInfo gating (harbor ValuesError)
- #2529 — objectstorage-controller BucketAccess conflict retry
- the daniil/split-vminstance PR (vminstance disk race + VM IP/ready timeouts)
- the daniil/split-event-driven PR (existence backstops surfacing real errors)

Until those land, dropping the retry will fail CI for unrelated PRs
that hit the seaweedfs / harbor / installer / vminstance races.

Signed-off-by: Myasnikov Daniil <myasnikovdaniil2001@gmail.com>
Assisted-By: Claude <noreply@anthropic.com>
Signed-off-by: Myasnikov Daniil <myasnikovdaniil2001@gmail.com>

.github/workflows/pull-requests.yaml

@@ -227,27 +227,18 @@ jobs:
           until make SANDBOX_NAME=$SANDBOX_NAME prepare-env; do
             attempt=$((attempt + 1))
             if [ $attempt -ge 3 ]; then
-              echo "❌ Attempt $attempt failed, exiting..."
+              echo "Attempt $attempt failed, exiting..."
               exit 1
             fi
-            echo "❌ Attempt $attempt failed, retrying..."
+            echo "Attempt $attempt failed, retrying..."
           done
-          echo "✅ The task completed successfully after $attempt attempts"
+          echo "Prepare environment completed after $attempt attempts"
 
       # ▸ Install Cozystack
       - name: Install Cozystack into sandbox
         run: |
           cd /tmp/$SANDBOX_NAME
-          attempt=0
-          until make -C packages/core/testing SANDBOX_NAME=$SANDBOX_NAME install-cozystack; do
-            attempt=$((attempt + 1))
-            if [ $attempt -ge 3 ]; then
-              echo "❌ Attempt $attempt failed, exiting..."
-              exit 1
-            fi
-            echo "❌ Attempt $attempt failed, retrying..."
-          done
-          echo "✅ The task completed successfully after $attempt attempts"
+          make -C packages/core/testing SANDBOX_NAME=$SANDBOX_NAME install-cozystack
 
       - name: Run OpenAPI tests
         run: |
@@ -262,23 +253,18 @@ jobs:
           failed_tests=""
           for app in $(ls hack/e2e-apps/*.bats | xargs -n1 basename | cut -d. -f1); do
             echo "::group::Testing $app"
-            attempt=0
-            success=false
-            until [ $attempt -ge 3 ]; do
-              if make -C packages/core/testing SANDBOX_NAME=$SANDBOX_NAME test-apps-$app; then
-                success=true
-                break
-              fi
-              attempt=$((attempt + 1))
-              echo "❌ Attempt $attempt failed, retrying..."
-            done
-            if [ "$success" = true ]; then
+            if make -C packages/core/testing SANDBOX_NAME=$SANDBOX_NAME test-apps-$app; then
+              echo "::endgroup::"
               echo "✅ Test $app completed successfully"
             else
-              echo "❌ Test $app failed after $attempt attempts"
+              echo "::endgroup::"
+              echo "❌ Test $app failed (no retry — see diagnostics below)"
               failed_tests="$failed_tests $app"
+              echo "::group::Diagnostics for $app"
+              docker exec "$SANDBOX_NAME" sh -c 'kubectl get hr -A -o wide 2>&1 | tail -50' || true
+              docker exec "$SANDBOX_NAME" sh -c 'kubectl get events -A --sort-by=.lastTimestamp 2>&1 | tail -30' || true
+              echo "::endgroup::"
             fi
-            echo "::endgroup::"
           done
           if [ -n "$failed_tests" ]; then
             echo "❌ Failed tests:$failed_tests"