ci(blocked_prs): fix multiline comment body in comment action

Signed-off-by: Rachel Powers <508861+Ryex@users.noreply.github.com>

.github/actions/create-comment/action.yml

@@ -36,7 +36,9 @@ runs:
           echo "Reading comment file from ${COMMENT_FILE}"
           comment_body="${comment_body}$(cat "$COMMENT_FILE")"
         fi
-        echo "COMMENT_BODY=$comment_body" >> "$GITHUB_ENV"
+        echo 'COMMENT_BODY<<EOF' >> "$GITHUB_ENV"
+        echo "$comment_body" >> "$GITHUB_ENV"
+        echo 'EOF' >> "$GITHUB_ENV"
 
     - name: Get Existing Comment Id
       shell: bash