Add complete test scaffolding support with --test flag for API projects (#5176)

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: kevwan <1918356+kevwan@users.noreply.github.com>

tools/goctl/api/gogen/jwt.api

@@ -0,0 +1,17 @@
+type Request {
+	Name string `path:"name,options=you|me"`
+}
+
+type Response {
+	Message string `json:"message"`
+}
+
+@server(
+	jwt: Auth
+	jwtTransition: Trans
+	middleware: TokenValidate
+)
+service A-api {
+	@handler GreetHandler
+	get /greet/from/:name(Request) returns (Response)
+}