[FEATURE] Use PHP script for XLIFF check in runTests.sh

[kanow]

Same as the core does the xliff check.

[coveralls]

Coverage Report for CI Build 27007007138

Coverage remained the same at 92.089%

Details

• Coverage remained the same as the base build.
• Patch coverage: No coverable lines changed in this PR.
• No coverage regressions found.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

No coverage regressions found.

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Coverage Stats

Relevant Lines:	316
Covered Lines:	291
Line Coverage:	92.09%
Coverage Strength:	3.79 hits per line

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💛 - Coveralls

[kanow]

I checked the functionality of the old lintXliff check. IMO the new che does all the things that the old lint command did. Therefore I removed the old lintXliff command.
I'm not sure about the naming of the composer script. For the moment i didn't change the script naming for composer. The name in github workflow is therefore also not changed.

[kanow]

Too much clean up ;-)
@oliverklee done, checks green