This PR adds memory foot print metrics to tests/metrics/density
folder.
Intentionally, each test exits w/ zero in all test cases to ensure
that tests would be green when added, and will be enabled in a
subsequent PR.
A workflow matrix was added to define hypervisor variation on
each job, in order to run them sequentially.
The launch-times test was updated to make use of the matrix
environment variables.
Fixes: #7066
Signed-off-by: David Esparza <david.esparza.borquez@intel.com>
