Update show tests

[klamike]

Update for JuliaSmoothOptimizers/NLPModels.jl#500

Should only be merged upon the next release of NLPModels

[klamike]

I'll refactor so it's just the show test fixes (ref JuliaSmoothOptimizers/NLPModels.jl#500)

[Copilot]

Pull request overview

This PR updates test expectations to be compatible with NLPModels 0.22, which introduces separate display of linear and nonlinear Jacobian non-zero counts in model output. The PR only modifies test files to reflect the new output format from NLPModels.

Key Changes:

• Updated expected output strings in "Show" tests to include two new fields: lin_nnzj and nln_nnzj
• These new fields display the counts of non-zero elements in the linear and nonlinear parts of the Jacobian separately
• All changes maintain arithmetic consistency: lin_nnzj + nln_nnzj = nnzj

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
test/nls/slack-model.jl	Added lin_nnzj and nln_nnzj lines to expected output (3 + 8 = 11)
test/nls/feasibility-residual.jl	Added lin_nnzj and nln_nnzj lines with "------" placeholder for unconstrained case
test/nls/feasibility-form-nls.jl	Added lin_nnzj and nln_nnzj lines to expected output (2 + 11 = 13)
test/nlp/slack-model.jl	Added lin_nnzj and nln_nnzj lines to expected output (2 + 3 = 5)
test/nlp/quasi-newton.jl	Added lin_nnzj and nln_nnzj lines to expected output (2 + 2 = 4)

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