Removing Five Unused Settings

[john-science]

What is the change? Why is it being made?

I have asked my power users and we believe the following Settings are unused and can safely be deleted:

• automaticVariableMesh
• operatorLocation
• thKernel
• summarizePower
• timelineInclusionCutoff

NOTE: I ran all the downstream unit and integration tests I could find, and they passed without problem.

Progress on #2384

SCR Information

Change Type: trivial

One-Sentence Rationale: This is the start of work to reduce the amount of fussing with Settings and Parameters in ARMI that our users need to do.

One-line Impact on Requirements: NA

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Checklist

• [x] This PR has only one purpose or idea.
• [x] Tests have been added/updated to verify any new/changed code.
• [x] The documentation is still up-to-date in the doc folder.
• [x] The code style follows good practices.
• [x] The dependencies are still up-to-date in pyproject.toml.