chore: remove shared cluster test for circle ci

[corban-beaird]

Ticket

Description

Removes the Shared Cluster workflow from the real config while the flake on this test workflow is being resolved.

Test Plan

• Ensure that CI doesn't include a shared cluster workflow

Checklist

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

[netlify]

✅ Deploy Preview for determined-ui canceled.

Name	Link
🔨 Latest commit	1c6de23
🔍 Latest deploy log	https://app.netlify.com/sites/determined-ui/deploys/667c9ea3d1dc700007b02f00

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 49.84%. Comparing base (d187243) to head (1c6de23).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9579      +/-   ##
==========================================
+ Coverage   49.80%   49.84%   +0.04%     
==========================================
  Files        1247     1247              
  Lines      162287   162287              
  Branches     2888     2887       -1     
==========================================
+ Hits        80820    80900      +80     
+ Misses      81296    81216      -80     
  Partials      171      171              

Flag	Coverage Δ
backend	43.94% <ø> (+<0.01%)	⬆️
harness	63.75% <ø> (+0.19%)	⬆️
web	46.22% <ø> (ø)

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see 9 files with indirect coverage changes