Change GAMS solver type for time limit adjustment

[shermanjasonaf]

Summary/Motivation:

The PyROS subsolver time limit adjustment routine introduced in #2660 does not properly detect the GAMS shell solver type (solvers.plugins.solvers.GAMS.GAMSShell or type(SolverFactory("gams", solver_io="shell")), for which the routine was originally written. This detection issue occurs as the GAMS shell solver type does not inherit from the generic GAMS solver interface type solvers.plugins.solvers.GAMS.GAMSSolver (accessed via SolverFactory.get_class("gams")).

In this PR, we ensure that the GAMS shell type, rather than the more generic interface, is detected
and acted upon in the subsolver time limit adjustment routine of #2660.

Changes proposed in this PR:

See summary.

Legal Acknowledgement

By contributing to this software project, I have read the contribution guide and agree to the following terms and conditions for my contribution:

1. I agree my contributions are submitted under the BSD license.
2. I represent I am authorized to make the contributions and grant the license. If my employer has rights to intellectual property that includes these contributions, I represent that I have received permission to make contributions and grant the required license on behalf of that employer.

[codecov]

Codecov Report

Base: 87.04% // Head: 86.73% // Decreases project coverage by -0.32% ⚠️

Coverage data is based on head (745aa17) compared to base (200e777).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2706      +/-   ##
==========================================
- Coverage   87.04%   86.73%   -0.32%     
==========================================
  Files         757      756       -1     
  Lines       84623    84586      -37     
==========================================
- Hits        73663    73367     -296     
- Misses      10960    11219     +259     

Flag	Coverage Δ
linux	84.45% <0.00%> (+<0.01%)	⬆️
osx	74.50% <0.00%> (ø)
other	84.63% <0.00%> (ø)
win	81.79% <0.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pyomo/contrib/pyros/util.py	78.10% <0.00%> (-6.73%)	⬇️
pyomo/contrib/pyros/master_problem_methods.py	53.25% <0.00%> (-34.68%)	⬇️
pyomo/contrib/pyros/pyros_algorithm_methods.py	75.30% <0.00%> (-18.08%)	⬇️
pyomo/contrib/pyros/separation_problem_methods.py	71.76% <0.00%> (-16.18%)	⬇️
pyomo/contrib/gdpopt/branch_and_bound.py	67.65% <0.00%> (-8.94%)	⬇️
pyomo/contrib/gdpopt/oa_algorithm_utils.py	96.00% <0.00%> (-4.00%)	⬇️
pyomo/opt/plugins/sol.py	83.61% <0.00%> (-2.83%)	⬇️
pyomo/contrib/pyros/pyros.py	93.19% <0.00%> (-1.05%)	⬇️
pyomo/contrib/pyros/uncertainty_sets.py	92.33% <0.00%> (-0.59%)	⬇️
... and 7 more

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