Remove custom instructions and comment payload from upstream sync issue creation

Author: brunoborges

.github/workflows/weekly-upstream-sync.yml

@@ -105,9 +105,6 @@ jobs:
 
           Follow the [agentic-merge-upstream](.github/prompts/agentic-merge-upstream.prompt.md) prompt to port these changes to the Java SDK."
 
-          # Read custom instructions from external file
-          CUSTOM_INSTRUCTIONS=$(cat .github/prompts/coding-agent-merge-instructions.md)
-
           # Build the issue JSON payload
           ISSUE_PAYLOAD=$(jq -n \
             --arg title "Upstream sync: ${COMMIT_COUNT} new commits (${DATE})" \
@@ -129,23 +126,6 @@ jobs:
               --jq '.number')
 
           echo "Created issue #${ISSUE_NUMBER}"
-
-          # Build the comment JSON payload to trigger Copilot
-          COMMENT_PAYLOAD=$(jq -n \
-            --arg instructions "$CUSTOM_INSTRUCTIONS" \
-            '{
-              body: ("@copilot\n\n" + $instructions)
-            }')
-
-          # Post the comment to assign Copilot
-          echo "$COMMENT_PAYLOAD" | \
-            gh api \
-              --method POST \
-              -H "Accept: application/vnd.github+json" \
-              -H "X-GitHub-Api-Version: 2022-11-28" \
-              "/repos/${REPO}/issues/${ISSUE_NUMBER}/comments" \
-              --input -
-
           echo "✅ Issue #${ISSUE_NUMBER} created and assigned to Copilot coding agent."
 
       - name: Summary