Fixes # .

Summary/Motivation:

Pyomo's existing pytest configuration supports marking solver tests using pytest.mark.solver(name), and then running those tests using a custom --solver name command line argument. However, the test selection was done by skipping tests at runtime and not deselecting the tests after collection. Further, the markers could not be used in "normal" marker expressions (because pytest does not support accessing positional arguments in marker expressions).

This PR redesigns how we handle solver markers:

• the positional argument is mapped to a keyword argument (id). This enables using markers expressions like solver(id='highs') to select tests based on the solver marker.
• an additional keyword argument (vendor) is also defined using a substring of id up to, but not including the first underscore. This supports selecting "all" tests for a vendor. For example solver(vendor='gurobi') will match gurobi, gurobi_direct, and gurobi_persistent solver markers.
• the --solver command line option is now translated into a marker expression (instead of relying on skipping tests at runtime)
• move the solver marker definition into the pyproject.toml (with all the other markers)

In addition, this PR:

• adds a writer marker that works analogously to the solver marker
• removes a number of unused pytest markers from pyproject.toml
• propagates the use of the solver marker through the solver tests in pyomo.solvers and pyomo.contrib.solver
• found a way to mark tests generated by paarameterized.expand

Changes proposed in this PR:

• (see above)

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.