feat: Add restart entries to constitutive drivers

[dkachuma]

Summary

This pull request migrates the constitutive driver tests from the unit test directory into the integrated test suite. These tests are effectively self‑contained GEOS simulation models and should be executed using the geos executable rather than through the unit-testing framework.

1. Introduced a New Base Class: ConstitutiveDriver

• A new abstract base class ConstitutiveDriver is introduced. All constitutive drivers will eventually inherit from this class.
• In this PR, only the PVTDriver is migrated; additional drivers will follow in subsequent PRs.

2. Output Table Registered as a restart property

• The output table is now registered as a property within ConstitutiveDriver.
• This property is written to the restart file, allowing the integrated test scripts to compare results against baseline restart data.

3. Consolidation of Common Parameters

• Parameters shared across multiple constitutive drivers are moved into the new base class.

4. Updated Output Behaviour

• If the user does not specify an output field:
  • Results are written to stdout, formatted using the new table output system.
• If an output field is specified:
  • Results are written to a simple CSV file, which is human readable.

5. Removal of baseline Field

• The old baseline field is removed. Since integrated tests compare against restart files, explicit baseline checks inside the constitutive drivers are no longer needed.
• As a result, these drivers no longer function as standalone unit tests; all testing is through the integrated test framework.

6. Test Relocation and Cleanup

• Tests moved from
  src/coreComponents/integrationTests/constitutiveTests
  to
  inputFiles/constitutiveDriver
• Legacy baselines associated with the old unit-test-style setup are removed.

7. Documentation Updates

• The PVTDriver documentation is updated to reflect these changes

[codecov]

Codecov Report

❌ Patch coverage is 1.65746% with 178 lines in your changes missing coverage. Please review.
✅ Project coverage is 58.61%. Comparing base (2acb3ef) to head (ef4d7c1).
⚠️ Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
...ponents/constitutiveDrivers/ConstitutiveDriver.cpp	0.00%	98 Missing ⚠️
...constitutiveDrivers/fluid/multiFluid/PVTDriver.cpp	0.00%	50 Missing ⚠️
...utiveDrivers/fluid/multiFluid/PVTDriverRunTest.hpp	0.00%	23 Missing ⚠️
...ponents/constitutiveDrivers/ConstitutiveDriver.hpp	0.00%	5 Missing ⚠️
src/coreComponents/events/tasks/TaskBase.cpp	50.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3883      +/-   ##
===========================================
- Coverage    58.87%   58.61%   -0.27%     
===========================================
  Files         1353     1354       +1     
  Lines       112953   112987      +34     
===========================================
- Hits         66504    66230     -274     
- Misses       46449    46757     +308     

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