Fixes # .

Summary/Motivation:

This resolves some lingering issues when deepcopying AutoSlot classes / Pyomo models.

• Ensure that the temporary state created when deepcopying Components is preserved until deepcopy is finished. This is a more robust solution to a patch that was introduced in Fix bug in AutoSlots deepcopy #3412
• Remove redundant deepcopy implementations (standardize all logic in AutoSlots)
• Fix a minor logic error when determining if components are in/out of the __block_scope__
• Minor performance improvements (enough so that pmedian8 runs slightly faster, even after the additional overhead of keeping the temporary states alive)

Changes proposed in this PR:

• (see above)

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