fix(workflow): Normalize instance_ids by stripping spaces instead of failing (#2529)

Co-authored-by: openhands <openhands@all-hands.dev>
Co-authored-by: OpenHands Bot <contact@all-hands.dev>

Author: 3 people

.github/workflows/run-eval.yml

@@ -62,8 +62,9 @@ on:
                 type: string
             instance_ids:
                 description: >-
-                    Comma-separated instance IDs to evaluate (no spaces).
+                    Comma-separated instance IDs to evaluate.
                     Example: "django__django-11583,django__django-12345".
+                    Spaces around commas are automatically stripped.
                     Leave empty to evaluate all instances up to eval_limit.
                 required: false
                 default: ''
@@ -191,17 +192,6 @@ jobs:
                     exit 1
                   fi
 
-            - name: Validate instance_ids (no spaces allowed)
-              if: github.event_name == 'workflow_dispatch' && github.event.inputs.instance_ids != ''
-              run: |
-                  INSTANCE_IDS="${{ github.event.inputs.instance_ids }}"
-                  if [[ "$INSTANCE_IDS" =~ [[:space:]] ]]; then
-                    echo "::error::instance_ids must not contain spaces. Use comma-separated values without spaces."
-                    echo "Got: '$INSTANCE_IDS'"
-                    echo "Example: 'django__django-11583,django__django-12345'"
-                    exit 1
-                  fi
-
             - name: Validate SDK reference (semantic version check)
               if: github.event_name == 'workflow_dispatch'
               env:
@@ -344,6 +334,9 @@ jobs:
                   AGENT_TYPE: ${{ github.event.inputs.agent_type || 'default' }}
                   TRIGGERED_BY: ${{ github.actor }}
               run: |
+                  # Normalize instance_ids: strip all spaces
+                  INSTANCE_IDS=$(printf '%s' "$INSTANCE_IDS" | tr -d ' ')
+
                   echo "Dispatching evaluation workflow with SDK commit: $SDK_SHA (benchmark: $BENCHMARK, eval branch: $EVAL_BRANCH, benchmarks branch: $BENCHMARKS_BRANCH, tool preset: $TOOL_PRESET)"
                   PAYLOAD=$(jq -n \
                     --arg sdk "$SDK_SHA" \