multi_server_environment setting now disallows config edits from Web UI #16760

Description:

Turning the multi_server_environment setting on now hides the following
settings from the Administration -> Settings -> General settings page:

• Archiving settings
• Email server
• Trusted Matomo hostname
• Update settings

...so that users cannot set these separately on different instances of Matomo. Assuming I got these right, are there any other settings that should be disabled when multi_server_environment is turned on?

Fixes #14390.

Review

• [ ] Functional review done
• [ ] Usability review done (is anything maybe unclear or think about anything that would cause people to reach out to support)
• [ ] Security review done see checklist
• [ ] Code review done
• [ ] Tests were added if useful/possible
• [ ] Reviewed for breaking changes
• [ ] Developer changelog updated if needed
• [ ] Documentation added if needed
• [ ] Existing documentation updated if needed

Makes sense @nina-py

Might need to add a note in config/global.ini.php for multi_server_environment that this flag doesn't need to be enabled when the config file is on a shared filesystem like NFS or EFS.

Thanks @tsteur, added a note to the global config file.

Hi @tsteur , is there anything else that needs to be done in this PR? Or are you guys just way too busy at the moment following the 4.0.x release?

@nina-py at the moment we're indeed quite busy with the Matomo 4 release. @sgiehl can you do another review maybe?