Add CompileTests for InternalImportsByDefault #1532

Job	Run time
Api Breakage Compared to main branch	1m 38s
fuzzing_regressions (debug)	3m 29s
sanitizer_testing (address, debug)	2m 34s
fuzzing_regressions (release)	2m 57s
core (5.10.1-noble, ref/heads/main)	17m 17s
sanitizer_testing (address, release)	5m 9s
core (5.9.2-focal, SWIFT_BUILD_TEST_HOOK="-Xswiftc -warnings-as-errors", ref/heads/main)	14m 34s
sanitizer_testing (thread, debug)	2m 41s
core (5.8.1-focal, SWIFT_BUILD_TEST_HOOK="-Xswiftc -warnings-as-errors", ref/heads/main)	13m 50s
sanitizer_testing (thread, release)	4m 28s
	1h 8m 37s

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