DMVP-9129: have gateway-api chart support to automaticlly creation/setting of https/tls protocol listeners tls configs

[mrdntgrn]

Summary:

• Added automatic TLS defaults for gateway-api Gateway listeners with protocol: HTTPS or protocol: TLS when tls is absent: renders mode: Terminate with certificateRefs pointing to Secret {gateway-name}-tls.
• Added explicit opt-out: setting tls: {} on an HTTPS/TLS listener results in no tls block in the rendered Gateway (for cases where TLS is handled elsewhere).
• Preserved pass-through behavior: when tls is non-empty, it is rendered exactly as provided (no merging/injection).
• Added/updated examples for default TLS, explicit TLS, and opt-out, and documented the behavior in the chart README; ran helm lint and rendered all gateway-api examples for regression checks.
• Bumped charts/gateway-api chart version 0.1.3 → 0.1.4.