T8517: add unit tests for vyos_lldp_interfaces module (#459)

• T8517: add unit tests for vyos_lldp_interfaces module

• T8517: add rendered state test for vyos_lldp_interfaces

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

• T8517: fix copyright header to use VyOS Networks attribution

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

• Changelog

• Potential fix for pull request finding

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

• T8517: revert unrelated .coderabbit.yaml and AGENTS.md drift

These two files were modified by automated review tooling on this
branch (quote-style normalization in .coderabbit.yaml; blank-line
insertions in AGENTS.md). They are out of scope for the LLDP
unit-tests PR — restore both to match origin/main.

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• T8517: corrected unit test

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Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
Co-authored-by: omnom62 <75066712+omnom62@users.noreply.github.com>
Co-authored-by: omnom62 <omnom62@outlook.com>
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>