Add args to the error PDF-UA/2 8.2.5.20-2

[Vladimir-Burshnev]

Closes: https://trello.com/c/ANfMFlsv
FE PR: https://github.com/duallab/pdf4wcag-webapp-gui/pull/258
Model PR: veraPDF/veraPDF-model#348
Validation PR: veraPDF/veraPDF-validation#737

[coderabbitai]

📝 Walkthrough

Walkthrough

Expanded Link annotation validation errors across seven profiles to include destination keys for conflicting link targets.

Changes

Link destination diagnostics

Layer / File(s)	Summary
Expand conflicting-link error payloads PDF_UA/2/.../verapdf-profile-8-2-5-20-t02.xml, PDF_UA/PDFUA-2*.xml, PDF_UA/WCAG-2-2-*.xml, PDF_UA/WTPDF-1-0-*.xml	PDLinkAnnot error messages and argument lists now include structDestinationKey and differentTargetAnnotDestinationKey alongside existing object-key details.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Suggested reviewers: maximplusov

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title matches the main change: adding arguments to the PDF-UA/2 8.2.5.20-2 error.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch add-args-to-8.2.5.20-2

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