fix(providers): make connection optional on WorkOS (#11270)

WorkOS: connection is not required field

```
// v4: works fine
WorkOSProvider({
    clientId: process.env.WORKOS_CLIENT_ID,
    clientSecret: process.env.WORKOS_API_KEY,
    allowDangerousEmailAccountLinking: true
    connection: 'workos'
  }),

// v5: errors because 'workos' is not recognized
  WorkOSProvider({
    clientId: process.env.WORKOS_CLIENT_ID,
    clientSecret: process.env.WORKOS_API_KEY,
    allowDangerousEmailAccountLinking: true
    connection: 'workos'
  } ),

// v5: type mismatched, but works fine
  WorkOSProvider({
    clientId: process.env.WORKOS_CLIENT_ID,
    clientSecret: process.env.WORKOS_API_KEY,
    allowDangerousEmailAccountLinking: true
  } as any),
```

Author: olegakbarov

packages/core/src/providers/workos.ts

@@ -150,7 +150,7 @@ export interface WorkOSProfile extends Record<string, any> {
  * :::
  */
 export default function WorkOS<P extends WorkOSProfile>(
-  options: OAuthUserConfig<P> & { connection: string }
+  options: OAuthUserConfig<P> & { connection?: string }
 ): OAuthConfig<P> {
   const { issuer = "https://api.workos.com/", connection = "" } = options