export coverage to pages

export coverage report to pages. Results can be seen here

I removed the -c option of maint/coverage. This options is very useful with maint/with_coverage, but in my opinion not so much on maint/coverage. It would make the logic for merged rapport a bit strange. Maybe I could add it back and have it treated as its own kind of test, so there would be unit/integration/other with other containing previous results?

Auto-deploying pages which are on a different branch is kinda awkward, maybe pages should be somewhere in main too?

I have some work already done to add fuzzing to the mix, but depending on the runner it can take up to 3h30 to run, which is way to long for a nightly job. If it end-up being run in CI, it should be a weekly job I believe.

Also fixed an issue where tests/chutney/teardown wouldn't teardown the chutney network when it failed to bootstrap entirely