Creates a pipeline image and eliminates "pipeline bloat" from the Kubespray image

[luksi1]

/kind cleanup

What this PR does / why we need it:

Downstream users of Kubespray should not have all of the bloat from pipeline requirements in the released Docker image

Which issue(s) this PR fixes:
Fixes #9411

Does this PR introduce a user-facing change?:
None

- Creates a separate image for pipeline tests
- Reduces the size of the released image

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[floryut]

@luksi1 Thank you, I like the idea of a gitlab pipeline image in the gitlab pipeline CR
I've added a cleanup rule not to bloat the CR indeed

The only downside I see here is the 10+ minutes added to every pipeline, but that don't seem like a big issue to me.

@oomichi WDYT ?

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: floryut, luksi1

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[yankay]

Thanks @luksi1
/lgtm

[yankay]

HI @luksi1 , the PR causes the CI broken :

would you please fix it ? :-)

[luksi1]

Odd. These tests passed in the PR. I'll take a look at it a bit later today.

[luksi1]

@yankay Can you please take a look at #9648? I believe this should fix the issue.