use get_run_value instead of as_single_value and split functions for adding tests later

src/cal_tools/agipdlib.py

@@ -82,6 +82,9 @@ class AgipdCtrl:
             # about bucketing the rate for managing meta-data.
             return round(float(self.run_dc[rep_rate_src].as_single_value()), 1)
 
+    def _get_acq_rate_instr(self) -> Optional[float]:
+        """Get acquisition (repetition rate) from INSTRUMENT source."""
+
     def _get_acq_rate_instr(self) -> Optional[float]:
         """Get acquisition (repetition rate) from INSTRUMENT source."""