Fix cuOpt solver name formatting for versions with != 3 components

[ramakrishnap-nv]

Fixes # .

Summary/Motivation:

_get_cuopt_version formats the solver name with "cuOpt %s.%s%s" % tuple(cuopt.__version__.split('.')), which requires the version to have exactly three dot-separated components. cuOpt nightly wheels carry a PEP 440 .post suffix (e.g. 26.10.0a37.post260819050903), giving four components and raising:

pyomo/solvers/plugins/solvers/cuopt_direct.py:37: in _get_cuopt_version
    CUOPTDirect._name = "cuOpt %s.%s%s" % CUOPTDirect._version
E   TypeError: not all arguments converted during string formatting

Since this runs in the attempt_import callback, it fires when Pyomo resolves its solver plugins and aborts pytest collection for any module that touches the solver list, not just cuOpt's own tests.

It also fixes the 3-component case, which dropped a separator: 26.10.00 rendered as cuOpt 26.1000.

cuopt.__version__	before	after
26.10.0a37.post260819050903	TypeError	cuOpt 26.10.0a37.post260819050903
26.10.00a37	cuOpt 26.1000a37	cuOpt 26.10.00a37
26.10.00	cuOpt 26.1000	cuOpt 26.10.00

Changes proposed in this PR:

• Format the cuOpt solver name from the version string directly, so it is correct for any number of version components. _version is unchanged, so version() behaviour is unaffected.

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Notes for reviewers (optional): The change is a one-line formatting fix. Verified by evaluating the format against the version strings cuOpt ships (release, nightly conda, nightly wheel) and by running black --check. No test was added — happy to add one if you'd like coverage for the version-parsing callback.

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[mrmundt]

@ramakrishnap-nv - It looks like something is not quite right with the tests - probably just a mismatch of method name.