* phi2 multipack
* update validation and examples for phi
* more updates to phi examples
* make sure to use the correct collator for phi multipack
* phi needs attention mask now for multipack
* if the special token already exists in the tokenizer, don't require in lora modules to save
* fix qlora yml for phi, fix phi test validation
* test qlora too
* make sure flash attention is enabled for the test
* don't use remote code for phi anymore
* reduce sequence len for sample packing phi
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