Resolve bugs when comparing results objects to other types

[jsiirola]

Fixes # .

Summary/Motivation:

IDAES integration tests pointed out the new implementation of MapContainer.__eq__ was fragile and would fail when comparing results objects to other (slotized) types. This PR resolves those errors and improves container testing.

Changes proposed in this PR:

• Catch cases when comparing Container objects to non-Container objects.
• Add additional tests

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