Merge branch '6-modify-tests-according-to-linter-rules' into 'main'

Remove unnecessary variable declaration

See merge request gaia-x/data-infrastructure-federation-services/tsa/policy!4

internal/service/policy/service_test.go

@@ -63,7 +63,7 @@ func TestService_Evaluate(t *testing.T) {
 
 	// prepare test request with empty body
 	testEmptyReq := func() *goapolicy.EvaluateRequest {
-		var body interface{} = nil
+		var body interface{}
 
 		return &goapolicy.EvaluateRequest{
 			Group:      "testgroup",