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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.

Also check for virtualenv2, as in some systems virtualenv is
the Python3 one, and remove code for
https://bugzilla.mozilla.org/show_bug.cgi?id=1345274 workaround.

This reverts commit 778d9e09.

We should be in shape now for Fenix-based nightly builds.

The prune-old-builds script has been moved to tor-browser-build.git, in
tools/ansible/roles/tbb-nightly-build/files/prune-old-builds.

With #31055 we don't have default obfs3 bridges anymore.