fix(occm/loadbalancer): enable proxy-protocol only for supported list…

[dulek]

What this PR does / why we need it:
This is copy of #2368 with merge conflict resolved and comments addressed.

Which issue this PR fixes(if applicable):
fixes #

Special notes for reviewers:

Release note:

the proxy-protocol is ignored when the listener protocol is not supported (UDP/SCTP)

[k8s-ci-robot]

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[dulek]

/cc @jichenjc @stephenfin

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/lifecycle stale

[kayrus]

/remove-lifecycle stale

[k8s-ci-robot]

PR needs rebase.

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