Add comments in setup-build-env/action.yml for where to document prereqs (and the separation between build/run and test).
Add some initial (very basic) text for `test_suites.rst`, listing prereqs and how to run the tests (with subsections for the different optional tests, which is currently docs, functional and unit).
Add sphinx-inline-tabs, use it for tidying up prereq instructions based on OS/platform (mostly helpful in the test suites doc where there are multiple sections split by OS).
Also fixes some single backticks that should be double backtick.
* Fix building and running unit tests
* Enable unit tests
* Add gtest always
* test-sanitizers.yml: Use makefile.conf
* proper test setup
* make it run on macOS
* Run libyosys build only for unit tests after testing is done
* Disable LTO on public CI
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Co-authored-by: Krystine Sherwin <93062060+KrystalDelusion@users.noreply.github.com>
