feat(services) use servicePort=0 to disable http port on service for tls terminated at LB

[mithunkrb]

What this PR does / why we need it:

With this change, servicePort=0 can be used to disable http port on service for the services exposed by LoadBalancer(for ex: proxy-service) and TLS is terminated at LB. This is helpful in the below scenario:

• SSL/TLS terminated at Load Balancer and therefore LB sends HTTP traffic to service.
• We use overrideServiceTargetPort to map service TLS port to container HTTP port.
• However, service still keeps exposing HTTP port which is not desired however its required to expose the http port on container.
• where its desired to only enable TLS in service however the TLS port in service is mapped to http port in container.

Which issue this PR fixes

(optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged)

• fixes #

Special notes for your reviewer:

Checklist

[Place an '[x]' (no spaces) in all applicable fields. Please remove unrelated fields.]

• [x] PR is based off the current tip of the main branch.
• [ ] Changes are documented under the "Unreleased" header in CHANGELOG.md
• [x] New or modified sections of values.yaml are documented in the README.md
• [x] Commits follow the Kong commit message guidelines

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