LaTeX: revisit and trim visit_target()
Refs: #13609, #11093 (#11333), #6026 (#6051).
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Fix misnomer in test-latex-labels/index.rst text.
Refs: https://github.com/sphinx-doc/sphinx/issues/13609#issuecomment-2934964031
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Patch writers/latex.py as per the proposal at end of: https://github.com/sphinx-doc/sphinx/issues/13609#issuecomment-2937087733
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Update test_latex_build.py::test_latex_labels to detect non desired extra label in LaTeX output.
Nota bene: this commit does not revert "Tests: update LaTeX label test expectations from Docutils r10151 (#13610)" (commit 68d56109ff50dd81dd31d4a01e3dccbd006c50ee) as it is still necessary for compatibility with both Docutils 0.21.2 and Docutils HEAD at their r10151.
The patch looks good to me to solve the test output issue. (Some issues discussed in #13609 remain open.)