Codemod examples/models/llama2 to examples/models/llama #4574

Job	Run time
build-benchmark-app / macos-job	2m 51s
build-demo-ios / macos-job	1m 37s
build-frameworks-ios / macos-job	2m 42s
upload-demo-ios	0s
test-demo-ios	0s
upload-frameworks-ios	0s
	7m 10s

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