Implement update OAuthApp endpoint for APIv4, add test (#7413)

model/client4.go

@@ -2631,6 +2631,16 @@ func (c *Client4) CreateOAuthApp(app *OAuthApp) (*OAuthApp, *Response) {
 	}
 }
 
+// UpdateOAuthApp
+func (c *Client4) UpdateOAuthApp(app *OAuthApp) (*OAuthApp, *Response) {
+	if r, err := c.DoApiPut(c.GetOAuthAppRoute(app.Id), app.ToJson()); err != nil {
+		return nil, BuildErrorResponse(r, err)
+	} else {
+		defer closeBody(r)
+		return OAuthAppFromJson(r.Body), BuildResponse(r)
+	}
+}
+
 // GetOAuthApps gets a page of registered OAuth 2.0 client applications with Mattermost acting as an OAuth 2.0 service provider.
 func (c *Client4) GetOAuthApps(page, perPage int) ([]*OAuthApp, *Response) {
 	query := fmt.Sprintf("?page=%v&per_page=%v", page, perPage)