conformance: validate Implementation.URL is a well-formed http(s) URL

[yashrajshuklaaa]

/kind feature
/area conformance-machinery

Adds URL validation to Implementation.Validate(). It checked required fields were non-empty but never checked the URL was actually valid.

Conformance report Implementation.URL is now validated as a well-formed http(s) URL.

[kubernetes-prow]

Hi @yashrajshuklaaa. Thanks for your PR.

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[robscott]

Thanks @yashrajshuklaaa!

[robscott]

Likely worth testing []string{} as well

[kubernetes-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: robscott, yashrajshuklaaa

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[robscott]

/ok-to-test