Provide minimum resource requirements for helper containers

Description

It would be better to specify minimum resource requirements for the helper containers. If recommending minimum values is not possible, providing benchmarking data would help customers make informed decisions when tuning Kubernetes executors.

Proposal

Define minimum resource requirements or benchmarking data for helper containers

Links to related issues and merge requests / references

This proposal comes from a GitLab Premium customer with 150 seats. Refer ZD(internal use only) for more details.