Report a warning on manifest_version 3 targeting Firefox for Android

[rpl]

Describe the problem and steps to reproduce it:

Manifest Version 3 support on Firefox for Android is currently limited compared to Firefox Desktop (as an example: on Firefox for Android there isn't currently any visual indication that would be highlighting to the user that an extension is currently pending on the user granting the host_permissions specified in the manifest before being able to access the currently active tab)

What happened?

We are not providing to the developers that may be targeting Firefox for Android any pointers related to the limitations they may be hitting when the extension being submitted is a manifest_version 3 extension.

What did you expect to happen?

We should be highlight to the user the limitations they would need to be aware of through a new linting warning, the linting warning should provide a link to a documentation page that can be provide a more detailed description of the limitation and how the developer may deal with (than how much we could fit into the linting warning description).

TODO list

• draft a patch to implement the new warning
• coordinate with @dotproto to detemine where the rule description should point the extension developer to get a more detailed description and guidance about the Fenix MV3 limitations they should be aware of

┆Issue is synchronized with this Jira Task