refactor(core): remove ai sdk option fields (#30581)

packages/core/test/plugin/provider-google.test.ts

@@ -52,17 +52,13 @@ describe("GooglePlugin", () => {
       const language = yield* aisdk.language(
         model("custom-google", "alias", {
           apiID: ModelV2.ID.make("gemini-api"),
-          endpoint: {
+          api: {
             type: "aisdk",
             package: "@ai-sdk/google",
           },
-          options: {
+          request: {
             headers: {},
-            body: {},
-            aisdk: {
-              provider: { apiKey: "test" },
-              request: {},
-            },
+            body: { apiKey: "test" },
           },
         }),
       )