Saving configuration in a loaded site is slow

• remove the tracking data rebuild from track_usage_config_update
• when entering the config edit form show a warning banner that says any change to the config might require full tracking data rebuild
• after submitting the form detect if there where configuration changes, if yes show a warning saying that you need to rebuild the tracking data with a link to the bulk update in the settings page

Looks good, thank you!

Fixing credits

Automatically closed - issue fixed for 2 weeks with no activity.