Fix line endings in c14n test files for n-triples and n-quads

[utafrali]

GitHub issue resolved #3845

Pull request Description:

The canonicalization tests for n-triples and n-quads were failing on Windows due to line ending inconsistencies. Git was normalizing line endings differently across platforms, which caused the test comparisons to fail.

This adds .gitattributes entries to enforce text eol=lf for the canonicalization test files in both rdf12/rdf-n-triples/c14n/ and rdf12/rdf-n-quads/c14n/, matching the pattern already used for other test files in the repo.

Tests pass locally on both platforms after the change.

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• Tests are included.
• Documentation change and updates are provided for the Apache Jena website.
• Commits have been squashed to remove intermediate development commit messages.
• Key commit messages start with the issue number (GH-xxxx)

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[afs]

Hi @utafrali,

Thank you very much. THis shows that there is another problem in this aera. The .gitattributes file was out-of-date in other ways. Files had been deleted to consistently use the official test versions.

Nowadays rdf-testing/RIOT/test-cg is an untouched copy of the official tests - we can update easily by delete-copy. Any local tweaking, if needed, happens in the test manifest processors (their aren't any tweaks for RDF syntax tests).

#3849 removes the jena-arq.gitattributes and updates the jena-arq/testing/rdf-tests-cg/rdf/.gitattributes‎ one
by copying it from rdf-tests - this also picks up an updated test - material from w3c/rdf-tests#316.

(And for anyone digging into the details - the rdf-tests-cg RDF/XML tests will have to change at sometime.)