Firefox 136 running on Windows in our lab seems to crash when accessing
the CDM. This happens in our background Windows service, but not in the
foreground when run as a regular user. We don't really understand the
nature of it, so we have to disable this in lab tests.
This reverts commit eda85d6607 (#8173),
but then goes a bit further:
- Add a flag to we know if we're running in the lab
- Narrow the workaround to lab test runs, not local runs or GitHub
Actions VM workflows
Joey Parrish