feat: allow configuring namespaced kernel parameters (sysctls) for a promotion stage(database-lab#160)

Description

Allow configuring namespaced kernel parameters (sysctls) for a promotion stage

Related issue

database-lab#160 (closed)

Examples

Checklist

• the MR description has been reviewed
• this MR contains text changes and they have been reviewed OR there are no texts changes
• this MR contains GUI/CLI changes and they have been reviewed OR there are no GUI/CLI changes
• this MR contains API changes and they have been reviewed OR there are no API changes