Avoid unnecessary calls for static data in client config

@pmahindrakar said:

> You mean this right
>
> ```
> if len(scopes) == 0 || cfg.UseAudienceFromAdmin {
> publicClientConfig, err := authClient.GetPublicClientConfig(ctx, &service.PublicClientAuthConfigRequest{})
> if err != nil {
> return nil, fmt.Errorf("failed to fetch client metadata. Error: %v", err)
> }
> // Update scopes from publicClientConfig
> if len(scopes) == 0 {
> scopes = publicClientConfig.GetScopes()
> }
> // Update audience from publicClientConfig
> if cfg.UseAudienceFromAdmin {
> audienceValue = publicClientConfig.GetAudience()
> }
> }
> ```
>
> Which also seems static data we can avoid calling into .

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