Switch from mockzilla to jest-webextension-mock

[flodolo]

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[flodolo]

@MikkCZ
Thoughts on this? I noticed #950 mentions a few issues that are still open

I confess this is mostly built through multiple iterations with LLMs…

[MikkCZ]

I started quite some time ago, then provided some PRs for jest-webextensions-mock, but they never got merged. The author became silent. I think we were in direct contact for a while, so I will try to ping them. If there is no reaction, I can probably fork it and do whatever is necessary to be done in the hard fork.

[MikkCZ]

Or... We create the mocks just for pontoon-addon, directly in this repository.

[MikkCZ]

There is a fresh release of jest-webextension-mock, which includes some of the API that pontoon-addon uses. I believe there are still a few missing, and I am working with the owner to get co-ownership.

Hopefully before that happens, I can get some time to implement those.

[MikkCZ]

Some my PRs were fixed. There are two missing APIs, which are not mocked, see #950.

Of course alternative it to drop/temporarily disable the tests.