Remove policy-controller test against k8s 1.22 as blocking

[cpanato]

will unblock sigstore/policy-controller#1269, which is fixing currently failing CI in policy-controller

[github-actions]

🍹 preview on sigstore-github-sync/sigstore/github-prod

Pulumi report

Previewing update (sigstore/github-prod)

View Live: https://app.pulumi.com/sigstore/sigstore-github-sync/github-prod/previews/b66f04ea-c768-4709-b2bc-cd10daff9061

@ Previewing update.....
pulumi:pulumi:Stack: (same)
[urn=urn:pulumi:github-prod::sigstore-github-sync::pulumi:pulumi:Stack::sigstore-github-sync-github-prod]
~ github:index/branchProtection:BranchProtection: (update)
    [id=BPR_kwDOHUzRc84B9eJN]
    [urn=urn:pulumi:github-prod::sigstore-github-sync::github:index/branchProtection:BranchProtection::policy-controller-main]
  ~ requiredStatusChecks: [
      ~ [0]: {
              ~ contexts: [
                  - [7]: "e2e tests (v1.22.x)"
                ]
            }
    ]
@ Previewing update....
Resources:
~ 1 to update
572 unchanged