Add vardok mapping not found tests (#396)

* update open api spec

* generate vardef client

* update openapi generator

* update test

* update spec

* Split get by vardok-id vardef-id

- Generate client
- Renaming
- Remove mocked tests

* Add not found tests

* Remove unused file

---------

Co-authored-by: Cecilie Seim <68303562+tilen1976@users.noreply.github.com>

Author: mmwinther

src/dapla_metadata/variable_definitions/_generated/.openapi-generator/FILES

@@ -11,7 +11,6 @@ vardef_client/models/contact.py
 vardef_client/models/create_draft.py
 vardef_client/models/create_patch.py
 vardef_client/models/create_validity_period.py
-vardef_client/models/get_vardok_vardef_mapping_by_id200_response.py
 vardef_client/models/klass_reference.py
 vardef_client/models/language_string_type.py
 vardef_client/models/list_variable_definitions200_response_inner.py

src/dapla_metadata/variable_definitions/_generated/vardef_client/__init__.py

@@ -37,7 +37,6 @@
     "CreateDraft",
     "CreatePatch",
     "CreateValidityPeriod",
-    "GetVardokVardefMappingById200Response",
     "KlassReference",
     "LanguageStringType",
     "ListVariableDefinitions200ResponseInner",
@@ -80,9 +79,6 @@
 from .models.create_draft import CreateDraft as CreateDraft
 from .models.create_patch import CreatePatch as CreatePatch
 from .models.create_validity_period import CreateValidityPeriod as CreateValidityPeriod
-from .models.get_vardok_vardef_mapping_by_id200_response import (
-    GetVardokVardefMappingById200Response as GetVardokVardefMappingById200Response,
-)
 from .models.klass_reference import KlassReference as KlassReference
 from .models.language_string_type import LanguageStringType as LanguageStringType
 from .models.list_variable_definitions200_response_inner import (