fix: Various fixes for test generation (#1125)

* go: Prevent test client import error
* mockserver: Prevent missing `testfiles` directory error

go.mod

@@ -24,7 +24,7 @@ require (
 	github.com/pkg/errors v0.9.1
 	github.com/sethvargo/go-githubactions v1.1.0
 	github.com/speakeasy-api/huh v1.1.2
-	github.com/speakeasy-api/openapi-generation/v2 v2.466.0
+	github.com/speakeasy-api/openapi-generation/v2 v2.466.1
 	github.com/speakeasy-api/openapi-overlay v0.9.0
 	github.com/speakeasy-api/sdk-gen-config v1.29.1
 	github.com/speakeasy-api/speakeasy-client-sdk-go/v3 v3.15.6

go.sum

@@ -565,8 +565,8 @@ github.com/speakeasy-api/libopenapi v0.0.0-20241006201546-c9e5f704a939 h1:LGtzWU
 github.com/speakeasy-api/libopenapi v0.0.0-20241006201546-c9e5f704a939/go.mod h1:9ap4lXBHgxGyFwxtOfa+B1C3IQ0rvnqteqjJvJ11oiQ=
 github.com/speakeasy-api/openapi v0.1.3 h1:VtTKyjLuBqqHmiOvofpg/VKr+jNbs28Kb0k2H84yZgQ=
 github.com/speakeasy-api/openapi v0.1.3/go.mod h1:t1HA3wPC8jpGRr0UHW+SIvIB8dT5RXXi39XLrIG/URU=
-github.com/speakeasy-api/openapi-generation/v2 v2.466.0 h1:VM2QPS1fkYWOFLax/B7xFM+aoevhq6hniyAyZAoRMLA=
-github.com/speakeasy-api/openapi-generation/v2 v2.466.0/go.mod h1:/v6eEi9kmN+ZzP7fKM/xnFEpMCvAEGQNe/BdnXhNzIQ=
+github.com/speakeasy-api/openapi-generation/v2 v2.466.1 h1:lOaEbFIg6gr/gwPkeLXMhGv3Nz3YwtC9h/6qxTEcAWM=
+github.com/speakeasy-api/openapi-generation/v2 v2.466.1/go.mod h1:/v6eEi9kmN+ZzP7fKM/xnFEpMCvAEGQNe/BdnXhNzIQ=
 github.com/speakeasy-api/openapi-overlay v0.9.0 h1:Wrz6NO02cNlLzx1fB093lBlYxSI54VRhy1aSutx0PQg=
 github.com/speakeasy-api/openapi-overlay v0.9.0/go.mod h1:f5FloQrHA7MsxYg9djzMD5h6dxrHjVVByWKh7an8TRc=
 github.com/speakeasy-api/sdk-gen-config v1.29.1 h1:oi//Zx9cIdL2KClrySYgNVU/ta4oYt8okies5bcQ+wI=