Fixing inconsistent results when using seed in examples (reopened)

[sscini]

Fixes # .

When using the reactor_design leave_N_out example in parmest, the results from multiple runs of the example vary a lot, with random seed defined.

Summary/Motivation:

Using a random seed should allow for reproducible results. Currently, the results vary in the leave_N_out reactor design example (pyomo/pyomo/contrib/parmest/examples/reactor_design/leaveNout_example.py) for parmest even with an active random seed. I included a temporary .py file (pyomo/pyomo/contrib/parmest/examples/reactor_design/mwe_bootstrap_error_SSE.py) with the minimum working example showing the results vary with multiple runs.

Changes proposed in this PR:

• Modify leaveNout_bootstrap_test to produce consistent outputs

TODO before converting from draft:

• Inform pyomo team
• Implement solution
• Testing

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[sscini]

Continuation of PR # 3608. Changed the branch name to be more consistent with goal, did not realize that would close PR. Thank you @blnicho for feedback and approval of change. Will make requested changes, make sure tests don't break, and change from draft to full PR.

[sscini]

@adowling2 @djlaky Ready for review, changes made examples reproducible with a set seed. Seeds also added to test_file. Test results:
Ran 44 tests in 14.982s
OK (skipped=2)