Add resource requests to all workloads

[eyalzek]

Since updating the cluster creation to Autopilot, it'd be best practice to specify resource requests for all containers instead of letting Autopilot decide for us [1] - also, the default values are fairly high (0.5 vCPU, 2GiB memory).

[1] https://cloud.google.com/kubernetes-engine/docs/concepts/autopilot-resource-requests#compute-class-defaults