Bug 2235244

The webUI installer has the Firefox icon in the overview, which is rather confusing. It also has a window title with "Mozilla Firefox" in it.

In https://bugzilla.redhat.com/show_bug.cgi?id=2231073#c3 , Martin Stransky says:

"In firefox-116.0.2-2.fc39 you can set MOZ_APP_REMOTINGNAME env variable which overrides default application name exported to system. Run as:

MOZ_APP_REMOTINGNAME="anaconda" firefox

You also need to install proper desktop file (/usr/share/applications/anaconda.desktop):

```
[Desktop Entry]
Version=1.0
Name=Anaconda
GenericName=Anaconda Installer
Comment=Install it!
Exec=anaconda
Icon=org.fedoraproject.AnacondaInstaller
Terminal=false
Type=Application
StartupNotify=true
```

You also need to create /usr/bin/anaconda launcher where you set all env variables etc."

This mechanism seems like it could address both the icon and window title issues. We already have https://bugzilla.redhat.com/show_bug.cgi?id=2230336 for the window title issue, so there is some confusing overlap here; two solutions have been mooted for that. One by Martin is the use of a MOZ_APP_TITLE env var, as described at https://bugzilla.redhat.com/show_bug.cgi?id=2230336#c3 . Another by halfline is using client side decorations, as per https://github.com/rhinstaller/anaconda/pull/5057 - but this may only address the title seen in the webUI window's header bar, it may not address the title used on the overview.

I'm guessing we might ultimately want to have both halfline's PR *and* a change to use MOZ_APP_REMOTINGNAME, so the window title is addressed both in the window header and the overview, and the icon used in the overview is also addressed.

Proposing as a Beta FE as a polish issue we ought to address for Beta if we can.

Reproducible: Always