Add new Github workflow to run sample plugin tests in cluster with multiple nodes

[cwperks]

Description

Add new Github workflow to run sample plugin tests in cluster with multiple nodes

Check List

• New functionality includes testing.
• New functionality has been documented.
• API changes companion pull request created.
• Commits are signed per the DCO using --signoff.
• Public documentation issue/PR created.

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[prudhvigodithi]

LGTM, may be we need a matrix to run by default and run with -PnumNodes=2.

[cwperks]

ya that's a good idea. Some integTests in the root project run with multiple nodes and have their test suites annotated accordingly (example).

The sample plugin is a useful tool for running integ tests with an actual plugin that schedules work so I think the integ tests can be expanded upon there esp as we add more functionality to the job scheduler.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 33.76%. Comparing base (c9857f0) to head (ba0ca91).
Report is 1 commits behind head on main.

❌ Your project status has failed because the head coverage (33.76%) is below the target coverage (75.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #795   +/-   ##
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  Coverage     33.76%   33.76%           
  Complexity      143      143           
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  Files            29       29           
  Lines          1380     1380           
  Branches        132      132           
=========================================
  Hits            466      466           
  Misses          877      877           
  Partials         37       37           

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