test: neutralize third-party fixture names

[antoinevalentinHA]

Five fixture strings named third-party works. They were test data and nothing else.

• Five replacements, in three test files: a pack path in the negative case of isConversionOutput, a metadata title, and a conversion record's source name.
• No behaviour and no functional assertion changed. Where a value is asserted, the fixture and its expected value changed together, so each comparison holds exactly as before. Assertion counts are identical file by file (20/20, 41/41, 59/59), as are the test counts (8/8, 12/12, 25/25).
• The .zip extension is kept where it is part of what the fixture represents. The fs case keeps its extensionless, space-bearing shape, which is what makes it a valid negative.
• Test counts unchanged: 282 Java, 57 JavaScript.
• No identified title left in the tracked repository: Lucky Luke, Lucky, Cornebidouille, Dans la classe, Daltons and Musique as a whole word all return zero.

No production code, no README, no TESTING.md. yarn.lock is untouched — the Luke it appears to contain is a substring of an integrity hash, not a title.

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