Rename Swift demos directories to use PascalCase (#635) #1696

Job	Run time
windows-2022	18m 41s
rockylinux/rockylinux:10	2m 29s
ubuntu-24.04	15m 9s
public.ecr.aws/amazonlinux/amazonlinux:2023	2m 21s
macos-26	37m 47s
	1h 16m 27s

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