Revert change to use verifyToken() and implicitly return access token per RFC6749

Author: cbaenziger

pkg/oidc/client/client.go

@@ -180,12 +180,10 @@ func (c *client) GetTokenByClientCredentials(ctx context.Context, in GetTokenByC
 	if err != nil {
 		return nil, fmt.Errorf("could not acquire token: %w", err)
 	}
-	if c.useAccessToken == true {
-		return &oidc.TokenSet{
-			IDToken:      token.AccessToken,
-			RefreshToken: token.RefreshToken}, nil
-	}
-	return c.verifyToken(ctx, token, "")
+	return &oidc.TokenSet{
+		IDToken:      token.AccessToken,
+		RefreshToken: token.RefreshToken,
+	}, nil
 }
 
 // GetDeviceAuthorization initializes the device authorization code challenge