Add :reliable test documentation and processes
Continuation of https://gitlab.com/gitlab-org/quality/team-tasks/issues/337
We should add documentation surrounding ...
- Technical Documentation
- How do we run the
:reliable
tests? - How often and what environments do we run these tests in?
- How do we run the
- Processes
- What constitutes a "reliable" test?
- How can an existing test be promoted to reliable?
- Can new tests added be considered "reliable?"