ci: add guest boot time performance test
ci: add guest boot time performance test

Added two tests that each boots a minimal microvm
with 2 CPUs, and 1GB of memory, one with network
and one without. Tests validate that guest userspace
is reached in under 150ms.

Signed-off-by: Adrian Catangiu <43487eb7d05f4ed2cf28dd3e748821285e5f7796@amazon.com>

firecracker-microvm/firecracker,firecracker-microvm/firecracker,firecracker-microvm/firecracker,firecracker-microvm/firecracker,firecracker-microvm/firecracker