docs: Describe multi rm k8s

[tara-det-ai]

##Description

Feature: Multiple Resource Managers for Kubernetes.
Docs: Add/Update the following:

• /reference/deploy/helm-config-reference
• /reference/deploy/master-config-reference
• /release-notes/multirm-for-k8s
• setup-cluster/k8s/setup-multiple-resource-managers

Related

#9050
#9122
#9119

Add a New Page to the K8S Setup Section

• Tentative title "Configure Multiple Resource Managers"
• Draft docs page for describing how to work with and manage multiple resource managers for kubernetes installations.
• Target audience: admin.
• Target release date: Not tied to a release.

For starters, we need to add examples mentioned here in #9016:
https://github.com/determined-ai/determined/pull/9016/files#r1532170203

• Walk through an example
• • e.g., Setting kubeconfig
• • e.g., Setting masterip/port for the different resource managers
• • Example of doing multicloud or multi gke cluster.

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[carolinaecalderon]

left some suggestions

[carolinaecalderon]

LGTM, thanks for working on this!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 40.49%. Comparing base (598784d) to head (dcc9811).
Report is 1 commits behind head on main.

Additional details and impacted files

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+ Misses      57672    56481    -1191     
  Partials      232      232              

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