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If the option test_post is defined and pointing to a subroutine, then
this subroutine will be run after each test.

We will be using this option to run an rsync after each Tor Browser build.

This should be closer to how it's done by tor-launcher and should
help us catch issues like tor-browser#40282.

window.content is disabled in early betas since 77.

Temptatively fixing this flaky test by waiting until HTTPS Everywhere
has loaded some rulesets.

Also fix https-everywhere tests for builtin addon.

- Use fixture server.
- Use same method for both worker and window tests.
- Require results to exactly match what we expect.