chore: add a devcluster.yaml for using multiple k8s clusters

[stoksc]

Ticket

RM-164

Description

Add a devcluster file to run Determined across multiple Kubernetes clusters locally.

Test Plan

Needs no testing.

Checklist

• Changes have been manually QA'd
• User-facing API changes need the "User-facing API Change" label.
• Release notes should be added as a separate file under docs/release-notes/.
  See Release Note for details.
• Licenses should be included for new code which was copied and/or modified from any external code.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 46.16%. Comparing base (ec43809) to head (63f099b).
Report is 20 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9151      +/-   ##
==========================================
- Coverage   46.18%   46.16%   -0.02%     
==========================================
  Files        1174     1174              
  Lines      145186   145186              
  Branches     2413     2412       -1     
==========================================
- Hits        67049    67025      -24     
- Misses      77929    77953      +24     
  Partials      208      208              

Flag	Coverage Δ
backend	43.49% <ø> (-0.06%)	⬇️
harness	63.99% <ø> (ø)
web	36.82% <ø> (ø)

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see 5 files with indirect coverage changes