Clean up calicoctl_alternate_download_url

[yckaolalala]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

calicoctl_alternate_download_url parameters added in #8474 and removed in #9515

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[calico] Clean up calicoctl_alternate_download_url and calicoctl.mirrors

[k8s-ci-robot]

Hi @yckaolalala. Thanks for your PR.

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[yankay]

It relate to the #9393

[floryut]

@yckaolalala Thank you 👍
lgtm this looks like no longer needed at all.

[MrFreezeex]

Thanks for the cleanup!
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: floryut, MrFreezeex, yckaolalala

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[MrFreezeex]

/ok-to-test

[yankay]

Thanks @yckaolalala