Eliminate bounds relaxation for WaterTAP Ipopt

[bknueven]

Fixes/Resolves: N/A

@avdudchenko reports in consistencies in the way domain=pyo.NonNegativeReals vs bounds=(0, None). I tracked this down to an issue in the way "bounds relaxation" is handled in the WaterTAP wrapper for Ipopt.

This PR would resolve this issue by turning off bounds relaxation altogether for the WaterTAP wrapper for Ipopt.

Summary/Motivation:

Users should expect consistent behavior.

Changes proposed in this PR:

• Turn off bounds relaxation for WaterTAP
• Update some testing baselines.

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