Check and fix ci tests

[rwalkerlewis]

Fix Python 2 print statements and invalid escape sequences to resolve CI test failures.

This PR addresses two main categories of Python syntax issues:

1. Python 2 print statements: Converted print statements in legacy data generation and restart check scripts to Python 3 print() function calls.
2. Invalid escape sequences: Changed regular expression strings in TestPetscVersion.py and LaTeX strings in plot_slipfn.py to raw strings (r"...") to correctly handle backslashes and prevent SyntaxWarnings.

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Note

Converts legacy print statements to Python 3, fixes invalid escape sequences, and adds thermoelastic/thermoporoelastic pytest modules.

• Tests:
  • Add materials/TestThermoelasticity.py and materials/TestThermoporoelasticity.py; register in tests/pytests/Makefile.am and materials/__init__.py.
  • Extend materials/TestAuxiliarySubfields.py to include AuxSubfieldsThermoelasticity and AuxSubfieldsThermoporoelasticity.
  • Use raw regex strings in utils/TestPetscVersion.py.
• Scripts/Utilities:
  • Update Python 2 print statements to Python 3 print() across playpen/viscorestart/*.py, tests/libtests/bc/data/absorbingdampers.py, tests/libtests/faults/data/{adjustsoln.py,cohesivedyn.py,slipth.py}.
  • Minor output tweak in playpen/viscorestart/run_all.py.
• Docs:
  • Use raw LaTeX strings for tick labels in docs/user/physics/faults/figs/plot_slipfn.py.

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[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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[rwalkerlewis]

@copilot fix stage 1 CI tests. it is failing at build docker image

[Copilot]

@rwalkerlewis I've opened a new pull request, #10, to work on those changes. Once the pull request is ready, I'll request review from you.