WIP: Remove and fix wrong battery metrics

Author: llucax

src/frequenz/sdk/timeseries/battery_pool/_metric_calculator.py

@@ -502,15 +502,13 @@ def __init__(
 
         super().__init__(used_batteries)
         self._battery_metrics: list[Metric | TransitionalMetric] = [
-            Metric.AC_ACTIVE_POWER,
             TransitionalMetric.POWER_INCLUSION_LOWER_BOUND,
             TransitionalMetric.POWER_EXCLUSION_LOWER_BOUND,
             TransitionalMetric.POWER_EXCLUSION_UPPER_BOUND,
             TransitionalMetric.POWER_INCLUSION_UPPER_BOUND,
         ]
 
         self._inverter_metrics: list[Metric | TransitionalMetric] = [
-            Metric.AC_ACTIVE_POWER,
             TransitionalMetric.ACTIVE_POWER_INCLUSION_LOWER_BOUND,
             TransitionalMetric.ACTIVE_POWER_EXCLUSION_LOWER_BOUND,
             TransitionalMetric.ACTIVE_POWER_EXCLUSION_UPPER_BOUND,

src/frequenz/sdk/timeseries/formula_engine/_formula_generators/_battery_power_formula.py

@@ -48,9 +48,7 @@ def generate(
                 in the component graph, or if not all batteries behind a set of
                 inverters have been requested.
         """
-        builder = self._get_builder(
-            "battery-power", Metric.AC_ACTIVE_POWER, Power.from_watts
-        )
+        builder = self._get_builder("battery-power", Metric.DC_POWER, Power.from_watts)
 
         if not self._config.component_ids:
             _logger.warning(