Extended PCT capabilities to low pressure for YHx

[Anthony-Bowers08]

(Ref. #261)

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	f80c7c	#292 f0140f
	Total	Total	+/-	New
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Compared against f80c7cb in job civet.inl.gov/job/3342972.

Removed tests

Added tests

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[simopier]

Thank you for this @Anthony-Bowers08!

I have several high level requests/suggestions:

1. Instead of adding a new material class, you should instead apply this in the existing ADMatInterfaceReactionYHxPCT class. There, you will see this if statement:

if (!_silence_warnings && ((neighbor_pressure < limit_pressure) || (neighbor_pressure > 1.e6)))

You should edit this if statement so that if the neighbor_pressure is above 1.e6 or lower than ~2.e2 (the lower pressure at which we have data if I remember properly), then an error is provided, if it is between 1.e6 and limit_pressure, then the current calculations for the high pressure regime is applied, and if it is between 2.e2 and limit_pressure, then it calculates the atomic fraction at the surface following the new equation you are proposing.
I think that should do it, and capture the plateau region. My concern is that we might see some oscillations around the plateau region, but we can test that and deploy a solution once we observe that.

2. I see that you have created an input file and submitted gold file, which is great. However, you need to also edit the test file related to this capability and add tests for all the configurations in the if statement above, with a particular focus on the new cases you are creating. The reason why the coverage currently fails is because despite adding a new input file, no additional test is being run.
   Note also that rather than create a brand new input file, you should instead use the cli_args option in the test file to utilize the existing file, but in the regime of interest to you. You will find example of that in the test file.

3. You will also need to update the documentation page (format in .md) to detail your new contribution to the existing capabilities.

4. Your python script should be merged with the existing one for ADMatInterfaceReactionYHxPCT. Do it all in there.

Let me know if you have any questions.