chore(automatedanalysis): use independent singlethreadexecutor if running on single CPU

[andrewazores]

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Related to cryostatio/cryostat-reports#199
Depends on cryostatio/cryostat-core#336

Description of the change:

This change allows an environment variable to be configured so that...

Motivation for the change:

This change is helpful because users may want to...

How to manually test:

1. Run CRYOSTAT_IMAGE=quay.io... bash smoketest.bash...
2. ...

[github-actions]

This PR/issue depends on:

• fix(reports): split rule evaluations across executor submissions cryostat-core#336
  By Dependent Issues (🤖). Happy coding!

[andrewazores]

/build_test

[github-actions]

Workflow started at 2/26/2024, 2:04:40 PM. View Actions Run.

[github-actions]

CI build and push: All tests pass ✅ (JDK21)
https://github.com/cryostatio/cryostat3/actions/runs/8054172186

[github-actions]

CI build and push: All tests pass ✅ (JDK17)
https://github.com/cryostatio/cryostat3/actions/runs/8054172186