Add and use throw_if_invalid function

Validates objects and raises an error if they are invalid

src/main/python/ddadevops/domain/common.py

@@ -18,6 +18,11 @@ class Validateable:
 
     def is_valid(self) -> bool:
         return len(self.validate()) < 1
+    
+    def throw_if_invalid(self):
+        if not self.is_valid():
+            issues = '\n'.join(self.validate())
+            raise ValueError(f"Invalid Validateable: {issues}")
 
 
 class DnsRecord(Validateable):

src/main/python/ddadevops/infrastructure/release_mixin/repo.py

@@ -124,7 +124,5 @@ class ReleaseContextRepository:
             self.version_repository.get_version(),
             self.main_branch,
         )
-        if not result.is_valid():
-            issues = '\n'.join(result.validate())
-            raise ValueError(f"invalid release: {issues}")
+        result.throw_if_invalid()
         return result