Use and fix support for Python 3.11 in Helm chart images

[consideRatio]

Summary of changes

Helm chart

• Complements Add support for Python 3.11 #659 with fixes in the k8s dask-cluster controller
• Builds dask-gateway-server image to use Python 3.11
• Builds dask-gateway image used for testing by scheduler and worker to use Python 3.11

CI System

• Fix for pyzmq not having a wheel for Centos 7 (manylinux_2_17 aka manylinux2014 needed)
• Fix for ci: pbs, hadoop, and maybe also slurm tests unreliable #643 - the scheduler and/or workers ran out of memory
• Adds pytest-timeout to provide logs before timing out