Add the new files for the Xcode project on the 1.x branch. #1025

Job	Run time
fuzzing_regressions (debug)	1m 53s
core (5.9.1, ref/heads/main)	17m 42s
fuzzing_regressions (release)	3m 8s
sanitizer_testing (address, debug)	3m 8s
core (5.8.1, ref/heads/main)	20m 45s
sanitizer_testing (address, release)	7m 9s
sanitizer_testing (thread, debug)	3m 29s
sanitizer_testing (thread, release)	7m 43s
core (5.7.3, ref/heads/main)	14m 41s
core (5.6.3, ref/heads/main)	15m 36s
core (5.5.3, ref/heads/main)	17m 14s
core (5.4.3, ref/heads/main)	18m 46s
core (5.3.3, ref/heads/main)	13m 35s
core (5.2.5, ref/heads/main)	17m 6s
core (5.1.5, ref/heads/main)	4m 25s
core (5.0.3, ref/heads/main)	5m 48s
core (4.2.4, ref/heads/main)	5m 16s
	2h 57m 24s

Provide feedback