test/e2e: rm systemd start test

[Luap99]

We have a lot of systemd and quadlet based tests in the system tests. This test doesn't seem very useful and it seems to flake so just remove it.

Fixes #23480

Does this PR introduce a user-facing change?

None

[openshift-ci]

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[packit-as-a-service]

We were not able to find or create Copr project packit/containers-podman-23650 specified in the config with the following error:

Cannot create a new Copr project (owner=packit project=containers-podman-23650 chroots=['centos-stream-10-x86_64', 'centos-stream-10-aarch64', 'centos-stream-9-x86_64', 'centos-stream-9-aarch64']): Copr: 'packit/containers-podman-23650' already exists. Copr HTTP response is 400 BAD REQUEST.

---

Unless the HTTP status code above is >= 500, please check your configuration for:

1. typos in owner and project name (groups need to be prefixed with @)
2. whether the project name doesn't contain not allowed characters (only letters, digits, underscores, dashes and dots must be used)
3. whether the project itself exists (Packit creates projects only in its own namespace)
4. whether Packit is allowed to build in your Copr project
5. whether your Copr project/group is not private

[edsantiago]

Okay, LGTM.

[rhatdan]

/lgtm