fix(gateway-operator): changeable host network value for gw-operator

[mprokopc]

What this PR does / why we need it:

Adding ability to change gateway-operator host network value by helm values. it's required when calico cni is used

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.
• [x] 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

[CLAassistant]

All committers have signed the CLA.

[mprokopc]

@pmalek could you review this PR, please?

[pmalek]

@mprokopc Just checking in, do you still want to contribute this change?