Add Flatcar 4081 CI test

[tico88612]

What type of PR is this?

/kind feature

What this PR does / why we need it:

Test for Flatcar stable version

Which issue(s) this PR fixes:

Fixes #11804

Does this PR introduce a user-facing change?:

NONE

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: tico88612
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[tico88612]

/ok-to-test

[tico88612]

@yankay @VannTen, could you help me to check the infrastructure (I'm not approver to do this) why can't we connect Flatcar's VM? thanks!

fatal: [test-vm-s55qw -> localhost]: FAILED! => {
    "changed": false,
    "elapsed": 240
}
MSG:
Timeout when waiting for 10.11.99.40:22
fatal: [test-vm-sghjv -> localhost]: FAILED! => {
    "changed": false,
    "elapsed": 240
}
MSG:
Timeout when waiting for 10.11.99.52:22