[Bug]: LWC must check the minimum webbrowser version

[Gustry]

What is the bug?

Similar to #3139 and ticket #2972, we need to hardcode the minimal webbrowser in the source code.
When releasing a new LWC version, we can update these values if needed.

In the mainconfig.ini.php :
https://github.com/3liz/lizmap-web-client/blob/master/lizmap/app/system/mainconfig.ini.php#L29..L32

Today, we are writing in the LWC wiki. But this doesn't work.
This wiki page is only useful for server administrator which know/go on github about this wikipage.

This won't avoid the normal user who land on a webpage showing a map, who doesn't know what is Lizmap etc.
Like https://af3v.org/les-voies-vertes/carte-du-schema-national-des-veloroutes-et-voies-vertes/

Steps to reproduce the issue

Visit LWC with different webbrowsers.

Versions

Any LWC versions

Check Lizmap plugin

• I have done the step just before in the Lizmap QGIS desktop plugin before opening this ticket. Otherwise, my ticket is not considered valid and might get closed.

QGIS server version, only if the section above doesn't mention the QGIS Server version

No response

Operating system

Ubuntu

Browsers

Firefox

Browsers version

All

Relevant log output

No response

[Gustry]

Adding that to 3.7.0, but it would be great if this can be backported