containerdisks: Remove centos presubmit

[lyarwood]

/cc @0xFelix

What this PR does / why we need it:

CentOS 7 is now EOL and no longer sync'd as of
kubevirt/containerdisks#148 so we can now remove the presubmit.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

Special notes for your reviewer:

Checklist

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• Design: A design document was considered and is present (link) or not required
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• Upgrade: Impact of this change on upgrade flows was considered and addressed if required
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Release note:

NONE

[0xFelix]

/approve
/lgtm

[kubevirt-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: 0xFelix

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[kubevirt-bot]

@lyarwood: Updated the job-config configmap in namespace kubevirt-prow at cluster default using the following files:

• key containerdisks-presubmits.yaml using file github/ci/prow-deploy/files/jobs/kubevirt/containerdisks/containerdisks-presubmits.yaml

In response to this:

/cc @0xFelix

What this PR does / why we need it:

CentOS 7 is now EOL and no longer sync'd as of
kubevirt/containerdisks#148 so we can now remove the presubmit.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

Special notes for your reviewer:

Checklist

This checklist is not enforcing, but it's a reminder of items that could be relevant to every PR.
Approvers are expected to review this list.

• Design: A design document was considered and is present (link) or not required
• PR: The PR description is expressive enough and will help future contributors
• Code: Write code that humans can understand and Keep it simple
• Refactor: You have left the code cleaner than you found it (Boy Scout Rule)
• Upgrade: Impact of this change on upgrade flows was considered and addressed if required
• Testing: New code requires new unit tests. New features and bug fixes require at least on e2e test
• Documentation: A user-guide update was considered and is present (link) or not required. You want a user-guide update if it's a user facing feature / API change.
• Community: Announcement to kubevirt-dev was considered

Release note:

NONE

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