Update Workbench config for load balancing #431
Description
With the release of Workbench 2023.09.0, there are new configuration options (https://docs.posit.co/ide/server-pro/load_balancing/configuration.html#enable-load-balancing). The helm chart should use the configuration and drop the documentation around supplying launcherPem and global.secureCookieKey as these will automatically be generated and stored in the DB now.