Bug fixes in the current parmest.py and example files

[slilonfe5]

Fixes # .

Summary/Motivation:

There is a raise error bug in the checks for experiment_outputs and unknown_parameters in the current parmest.py file: it fails to raise an error when the pyomo model used in the parmest example files lacks these attributes.

Changes proposed in this PR:

• Add a raise in the try and except code that checks for experiment_outputs and unknown_parameters in the current parmest.py file
• Add an experiment_outputs attribute to the pyomo model of the parmest examples that lack this attribute

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[slilonfe5]

@adowling2 @djlaky @mrmundt @jsiirola I fixed the parmest raise error bug that we talked about at the Tuesday Dev meeting. This should be ready for review.

[adowling2]

@slilonfe5 Did you address all of the feedback? Is this ready for final review?

[slilonfe5]

@adowling2 @djlaky @jsiirola @mrmundt I have addressed the feedback from John. This PR is ready for final review.

[blnicho]

@slilonfe5 did you see the review comments I left you a couple days ago? Let me know if you have any questions.

[slilonfe5]

@blnicho Yes. Thank you for your feedback. I'm working on them now

[mrmundt]

A little comment - I think this is very close to ready.

[slilonfe5]

@mrmundt @blnicho @jsiirola @adowling2 @djlaky I have implemented the feedback from the final review. This PR is ready to be merged into the Pyomo main. I will move this to "Done" in the ParmEst & Pyomo.DoE Development board.

A kind reminder that this PR needs to be merged into the Pyomo main to enable PR #3535 to go through.

Thank you