IBX-11493: Added language code validation#736

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Steveb-p wants to merge 7 commits intomainfrom

ibx-11493/language-code-validation

Commits on Mar 24, 2026

Updated `KERNEL_CLASS` in PHPUnit configuration to use `CoreTestKernel` instead of `IbexaSolrTestKernel`
Steveb-p
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Updated `KERNEL_CLASS` in PHPUnit configuration to use `IbexaSolrTestKernel` and added `CoreSolrTestKernel` implementation
Steveb-p
committed