test: Remove e2e test

[henrywang]

This PR removed e2e test here because QE already has daily e2e test for bootc latest main copr build.

xref: #868

[henrywang]

The integration test failure is not caused by this PR. It'll be fixed in another PR later.

[cgwalters]

BTW I asked and the recent constant e2e failures here are because it's unable to provision virt-capable metal machines in the target cloud.

I would like to investigate again using nested virt in GCP at least instead as we've had pretty decent luck with using that for at least sanity testing.

[henrywang]

I would like to investigate again using nested virt in GCP at least instead as we've had pretty decent luck with using that for at least sanity testing.

I use GCP VM as Github action runner to run RHEL for Edge test (nested virt required) before. It works. (x86_64 only, arm GCP VM does not support nested virt)

We can drop testing farm and use tmt to run test on GCP VM directly, like tmt run provision -h connect --guest x.x.x.x --user root --key x/private_key plan xxx. And GCP is CNCF supported cloud.