feat(admission-controller): add PDB, enable HPA and deprecate scanning

[tembleking]

What this PR does / why we need it:

• Adds a Pod Disruption Budget
• Enables the creation of the Horizontal Pod Autoscaler by default, to ensure the deployment scales up in high demanding environments.
• Disables and deprecates the scanning deployment by default. This scanner is not present either in the SaaS product nor in on-prem installations anymore. It will be removed in a later version.

Checklist

• Title of the PR starts with type and scope, (e.g. feat(agent,node-analyzer,sysdig-deploy):)
• Chart Version bumped for the respective charts
• Variables are documented in the README.md (or README.tpl in some charts)
• Check GithubAction checks (like lint) to avoid merge-check stoppers
• All test files are added in the tests folder of their respective chart and have a "_test" suffix