Fix PR finding spacing issue

Review comment from Copilot:

- #2113 (comment)
- #2113 (comment)

Signed-off-by: Martin Hickey <martin.hickey@ie.ibm.com>

Author: hickeyma

.github/workflows/pr-kind-label.yaml

@@ -27,8 +27,7 @@ jobs:
             done
 
           # Extract /kind values from PR body and apply labels
-          printf '%s' "$PR_BODY" | tr -d '\r' | grep '^/kind ' | \
-            sed 's|^/kind ||' | sort -u | \
+          printf '%s' "$PR_BODY" | tr -d '\r' | sed -n 's|^/kind[[:space:]][[:space:]]*||p' | sed 's|[[:space:]]*$||' | sort -u | \
             while IFS= read -r kind; do
               [ -z "$kind" ] && continue
               gh pr edit "$PR_NUMBER" --repo "$REPO" --add-label "kind/$kind" || \
@@ -65,8 +64,8 @@ jobs:
           REPO: ${{ github.repository }}
         run: |
           # Use the last /milestone directive in the PR body
-          milestone=$(printf '%s' "$PR_BODY" | tr -d '\r' | sed -n 's|^/milestone ||p' | \
-            tail -n 1)
+          milestone=$(printf '%s' "$PR_BODY" | tr -d '\r' | sed -n 's|^/milestone[[:space:]][[:space:]]*||p' | \
+             sed 's|[[:space:]]*$||' | tail -n 1)
           [ -z "$milestone" ] && exit 0
           gh pr edit "$PR_NUMBER" --repo "$REPO" --milestone "$milestone" || \
             echo "::warning::Milestone '$milestone' not found in repository"