Split the Package.swift files for CompileTests. (#1743) #1611

Job	Run time
swift-format Check	0s
Api Breakage Compared to main branch	0s
fuzzing_regressions (debug)	3m 46s
core (6.0.3-noble, SWIFT_BUILD_TEST_HOOK="-Xswiftc -warnings-as-errors", ref/heads/main)	14m 56s
fuzzing_regressions (release)	3m 8s
core (5.10.1-noble, ref/heads/main)	16m 18s
sanitizer_testing (address, debug)	2m 45s
core (5.9.2-focal, SWIFT_BUILD_TEST_HOOK="-Xswiftc -warnings-as-errors", ref/heads/main)	14m 52s
sanitizer_testing (address, release)	5m 18s
sanitizer_testing (thread, debug)	2m 51s
core (5.8.1-focal, SWIFT_BUILD_TEST_HOOK="-Xswiftc -warnings-as-errors", ref/heads/main)	14m 2s
sanitizer_testing (thread, release)	5m 0s
	1h 22m 56s

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