Add optional force_fetch field for all dependency types (#1242)

## Proposed Changes

Move the optional `force_fetch` field to the
`KapitanDependencyBaseConfig` type.

We access the `force_fetch` field without regard to the dependency type
in
https://github.com/kapicorp/kapitan/blob/593e5f90888fcd48bed2477f1f22407187e1845b/kapitan/targets.py#L118

## Docs and Tests

* [ ] Tests added
* [ ] Updated documentation

kapitan/inventory/model/dependencies.py

@@ -17,14 +17,14 @@ class KapitanDependencyBaseConfig(BaseModel):
     type: KapitanDependencyTypes
     source: str
     output_path: str
+    force_fetch: Optional[bool] = False
 
 
 class KapitanDependencyHelmConfig(KapitanDependencyBaseConfig):
     type: Literal[KapitanDependencyTypes.HELM] = KapitanDependencyTypes.HELM
     chart_name: str
     version: Optional[str] = None
     helm_path: Optional[str] = None
-    force_fetch: Optional[bool] = False
 
 
 class KapitanDependencyGitConfig(KapitanDependencyBaseConfig):