ci: remove upstream-windows-serial-slow configs

[jackfrancis]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

This PR removes "Serial" + "Slow" Windows conformance configs, now that we no longer have a native test to gather that coverage. Ref:

• capz: remove windows conformance slow test kubernetes/test-infra#33197

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:

• cherry-pick candidate

TODOs:

• squashed commits
• includes documentation
• adds unit tests

Release note:

NONE

[jackfrancis]

cc @jsturtevant @marosset

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 51.15%. Comparing base (a91680a) to head (8bcbd9f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5049   +/-   ##
=======================================
  Coverage   51.15%   51.15%           
=======================================
  Files         274      274           
  Lines       24665    24665           
=======================================
  Hits        12617    12617           
  Misses      11262    11262           
  Partials      786      786           

☔ View full report in Codecov by Sentry.
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[jsturtevant]

did you want to clean up files like https://github.com/kubernetes-sigs/cluster-api-provider-azure/blob/main/test/e2e/data/kubetest/upstream-windows-serial-slow.yaml?

[jackfrancis]

did you want to clean up files like https://github.com/kubernetes-sigs/cluster-api-provider-azure/blob/main/test/e2e/data/kubetest/upstream-windows-serial-slow.yaml?

lol I thought I had! done now

[jsturtevant]

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 25d160661465aaa309c0ac62181e40a60c07edf8

[jackfrancis]

/retest

[jackfrancis]

/approve

[k8s-ci-robot]

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