Policy templates for Firefox 112 and Firefox ESR 102.10

Note: While these templates will work for Firefox ESR 91, they contain new policies that are not in Firefox ESR 91. If you need to manage Firefox ESR 91, you should use v3.10

The README that corresponds to this release is:

https://github.com/mozilla/policy-templates/blob/v4.10/README.md

This release updates the following policies:

EnableTrackingProtection - Add EmailTracking support.
Preferences - xpinstall.signatures.required can now be set via policy on the ESR only.

I have not removed Proxy Settings from its old location yet. I will soon.

For more information about Firefox 112 and Firefox ESR 102.10, we now have enterprise release notes.

Thanks to @vossni for contributing to this release.