refactor(monitoring): remove hardcoded tool paths

Remove SAPCONTROL_PATH and HDBSQL_PATH variables from configuration.
Update scripts to rely on the system PATH environment variable when
executing as the <sid>adm user. Remove redundant existence checks for
these commands.

hana_queue.sh

@@ -19,13 +19,6 @@ trap 'release_lock "$SCRIPT_NAME"' EXIT
 
 log_message "$SCRIPT_NAME" "Starting statement queue check..."
 
-# Check if hdbsql is available
-if [ ! -x "$HDBSQL_PATH" ]; then
-    log_message "$SCRIPT_NAME" "ERROR: hdbsql not found or not executable at ${HDBSQL_PATH}"
-    send_alert "$SCRIPT_NAME" "HANA Monitor Error" "hdbsql not found or not executable at ${HDBSQL_PATH}"
-    exit 1
-fi
-
 # SQL Query for statement queue
 STATEMENT_QUEUE_SQL="SELECT COUNT(*) FROM M_SERVICE_THREADS WHERE THREAD_TYPE = 'SqlExecutor' AND THREAD_STATE = 'Queueing';"