E2E Test for regex paths

[strongjz]

We have unit tests for path types but not very complex ones, we need to add e2e tests with complex examples to help prevent issues such #9464 and #9462

Additional test like these https://github.com/kubernetes/ingress-nginx/blob/main/test/e2e/ingress/pathtype_prefix.go

with more complex paths should be added to testing.

[strongjz]

/triage accepted
/kind feature
/priority backlog
/help-wanted
/good-first-issue

[k8s-ci-robot]

@strongjz:
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In response to this:

/triage accepted
/kind feature
/priority backlog
/help-wanted
/good-first-issue

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[philnichol]

@strongjz I'm happy to take a look at this if that's cool?
Edit: left it since there was a PR open already