Merge upgrade and conformance alert backstop tests

[dgoodwin]

TRT-664

This change brings together two tests that were originally copied code that has drifted in the years since into one code path. (post-upgrade alert check, post conformance/e2e alert check)

I've maintained the ability to allow different sets of pending/firing alerts for each use case.

Allowed alerts live in two similar files side by side for easier diffability.

No functional changes are intended, other than combining to one method of checking for cluster tech preview feature gate which looked most correct, and syncing the alerts we'd allow in this case. (one path allowed two alerts, the other path allowed one and in a more specific form, they both now allow two in the more generic form without a namespace limitation)

• Remove TEST_UNSUPPORTED_ALLOW_VERSION_SKEW which appears unused in release repo.
• wip: breakout code to comparable locations
• wip: begin syncing code paths
• wip: Break alert allowances out to separate files for comparison
• wip: Sync TechPreview feature gate check and allowances
• wip: Fix conformance compile errors
• wip: Fork logic on flake reporting, unsure what the implications of choosing here are
• wip: Make text in test messages more generic as we re-use the function
• wip: Extract subtle differences in how test duration is calculated
• wip: Drop the temp conformance.go file, now merged into check.go
• Add some godoc

[openshift-ci]

@dgoodwin: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-metal-ipi-ovn-ipv6	87bb855	link	false	/test e2e-metal-ipi-ovn-ipv6
ci/prow/e2e-openstack-ovn	87bb855	link	false	/test e2e-openstack-ovn
ci/prow/e2e-aws-ovn-single-node-upgrade	87bb855	link	false	/test e2e-aws-ovn-single-node-upgrade
ci/prow/e2e-metal-ipi-sdn	87bb855	link	false	/test e2e-metal-ipi-sdn
ci/prow/e2e-aws-ovn-upgrade	87bb855	link	false	/test e2e-aws-ovn-upgrade
ci/prow/e2e-aws-ovn-cgroupsv2	87bb855	link	false	/test e2e-aws-ovn-cgroupsv2

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[stbenjam]

/lgtm
/override ci/prow/e2e-aws-ovn-fips
/override ci/prow/e2e-gcp-ovn-upgrade
/skip

[openshift-ci]

@stbenjam: Overrode contexts on behalf of stbenjam: ci/prow/e2e-aws-ovn-fips, ci/prow/e2e-gcp-ovn-upgrade

In response to this:

/lgtm
/override ci/prow/e2e-aws-ovn-fips
/override ci/prow/e2e-gcp-ovn-upgrade
/skip

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dgoodwin, stbenjam

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