[dagster-tableau] Make new Power BI semantic model refresh fn experim…

…ental (#25599)

## Summary & Motivation

See
[comment](#25591 (review))
in #25591

python_modules/libraries/dagster-powerbi/dagster_powerbi/assets.py

@@ -4,6 +4,7 @@
     _check as check,
     multi_asset,
 )
+from dagster._annotations import experimental
 from dagster._core.definitions.asset_spec import AssetSpec
 from dagster._core.definitions.assets import AssetsDefinition
 from dagster._core.execution.context.asset_execution_context import AssetExecutionContext
@@ -12,6 +13,7 @@
 from dagster_powerbi.translator import PowerBIMetadataSet, PowerBITagSet
 
 
+@experimental
 def build_semantic_model_refresh_asset_definition(
     resource_key: str, spec: AssetSpec
 ) -> AssetsDefinition: