[Chart/Gateway][Chart/Gateway-OTK] Add Sticky Session to Gateway Charts

[alisterz]

Description of the change Current Gateway chart doesn't not have sticky session enabled, which causes timeout issue when using Policy Manager with scaled (>2 pods) gateway deployments

Benefits

Allow Policy Manager continue to work even when Gateway is scaled to multiple pods, no more timeout issues.

Drawbacks N/A

Applicable issues N/A

Additional information Identical approach Portal charts are using.

Checklist

• [X] Chart version bumped in Chart.yaml according to semver.
• [X] Variables are documented in the README.md
• [X] Title of the PR starts with chart name (e.g. [charts/gateway])
• [X] If the chart contains a values-production.yaml apart from values.yaml, ensure that you implement the changes in both files

[alisterz]

Sticky sessions should be configurable via values.yaml and optional.

intention was to have it enabled by default so when ppl scale up GW, Policy Manager still works.

Is there a way to enable it only for like 9443 port instead for all server ports?

[amoghsa]

I agree with @Gazza7205 here. This needs to be optional and configurable via values.yaml, if customer wants to keep a closed environment they should be able to keep it that way for security purposes.