[LoRA] Fix SDXL text encoder LoRAs (#4371)
* temporarily disable text encoder loras.
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* debbuging.
* modify doc.
* rename tests.
* print slices.
* fix: assertions
* Apply suggestions from code review
Co-authored-by: Patrick von Platen <patrick.v.platen@gmail.com>
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Co-authored-by: Patrick von Platen <patrick.v.platen@gmail.com>
