chore: enhance cherry-pick PR format with original context

- Make cherry-pick PRs easier to understand with descriptive titles
- Preserve original PR context to maintain decision history
- Improve reviewer experience with linked source PR

Signed-off-by: Vincent Demeester <vdemeest@redhat.com>

Author: vdemeester

.github/workflows/cherry-pick-command.yaml

@@ -111,7 +111,7 @@ jobs:
 
             # Get PR information
             echo "Fetching PR #$PR_NUMBER information..."
-            PR_DATA=$(gh pr view $PR_NUMBER --repo ${{ github.repository }} --json state,mergeCommit,mergedAt)
+            PR_DATA=$(gh pr view $PR_NUMBER --repo ${{ github.repository }} --json state,mergeCommit,mergedAt,title,body)
 
             # Check if PR is merged
             PR_STATE=$(echo "$PR_DATA" | jq -r '.state')
@@ -122,7 +122,10 @@ jobs:
             fi
 
             MERGE_COMMIT=$(echo "$PR_DATA" | jq -r '.mergeCommit.oid')
+            PR_TITLE=$(echo "$PR_DATA" | jq -r '.title')
+            PR_BODY=$(echo "$PR_DATA" | jq -r '.body')
             echo "Found merge commit: $MERGE_COMMIT"
+            echo "PR title: $PR_TITLE"
 
             # Fetch target branch
             echo "Fetching target branch: $TARGET_BRANCH..."
@@ -169,12 +172,23 @@ jobs:
 
             # Create pull request
             echo "Creating pull request..."
+
+            # Prepare PR body with original content
+            PR_BODY_CONTENT=$(cat <<EOF
+This is a cherry-pick of #$PR_NUMBER
+
+---
+
+$PR_BODY
+EOF
+)
+
             gh pr create \
               --repo ${{ github.repository }} \
               --base "$TARGET_BRANCH" \
               --head "$CHERRY_PICK_BRANCH" \
-              --title "Cherry-pick #$PR_NUMBER to $TARGET_BRANCH" \
-              --body "Automatic cherry-pick of #$PR_NUMBER to \`$TARGET_BRANCH\`"
+              --title "[cherry-pick: $TARGET_BRANCH] $PR_TITLE" \
+              --body "$PR_BODY_CONTENT"
 
             echo "✅ Cherry-pick completed successfully!"
           } 2>&1 | tee "$OUTPUT_FILE"