Fixes#2267.
This PR doesn't decrease the coverage, because every job is tested either per PR or
nightly run (instead of 2 times as it was before). Actually, it even increases it because
Android is tested with Ubuntu 20 now which was disabled before.
Add nightly (UTC time) checks with asan and ubsan, and also put gcc-4.8 build
to nightly run since we don't need to run it with every PR.
Co-authored-by: Maksim Litskevich <makslit@amazon.co.uk>
