Allow any protocol for cors origins

[iterion]

What this PR does / why we need it:

Some applications which wrap browsers (like Tauri) use an origin such as tauri://localhost. Since the ingress-nginx regex only allows http[s] that means we can't easily enable cors for our tauri app.

This PR broadens the regex for the origin to allow any protocol. From my read, the regex that is generated for the nginx config should still correctly work with any protocol.

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] CVE Report (Scanner found CVE and adding report)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Documentation only

Which issue/s this PR fixes

How Has This Been Tested?

I've updated the tests to cover a case I'd like to see, and I'll be doing further testing in our environment soon.

Update: we've deployed this to production and it's been working as expected for us and fixes our Tauri cors issues.

Checklist:

• [x] My change requires a change to the documentation.
• [x] I have updated the documentation accordingly.
• [x] I've read the CONTRIBUTION guide
• [x] I have added unit and/or e2e tests to cover my changes.
• [x] All new and existing tests passed.

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[strongjz]

/ok-to-test /triage accepted /kind feature /priority backlog

@iterion can you check on the golint error and/or add an ignore statement

[iterion]

Done! I noticed elsewhere enableAnnotation is used for similar circumstances, so I just repeated that idiom here to fix the lint.

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/remove-lifecycle frozen

[rikatz]

/lgtm Leaving for some other @kubernetes/ingress-nginx-maintainers to approve

[rikatz]

/lgtm Thanks

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: iterion, rikatz

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