fix(ios): Respect SENTRY_ALLOW_FAILURE in Xcode build scripts #3783

Job	Run time
Ready-to-merge gate / Missing "ready-to-merge" label	3s
auth_token_check / auth_token_check	2s
diff_check / diff_check	12s
metrics (legacy, ios)	14m 19s
metrics (new, android)	15m 56s
metrics (new, ios)	16m 10s
metrics (legacy, android)	14m 45s
Build RN 0.71.19 legacy hermes ios production no	7m 46s
Build RN 0.83.0 legacy hermes ios production no	8m 54s
Build RN 0.71.19 legacy jsc ios production no	7m 4s
Build RN 0.71.19 legacy hermes android production no	4m 36s
Build RN 0.71.19 legacy jsc android production no	4m 53s
Build RN 0.83.0 legacy hermes android production no	6m 42s
Build RN 0.83.0 new hermes ios production no	8m 33s
Build RN 0.83.0 new hermes ios production static	8m 25s
Build RN 0.83.0 legacy hermes ios production dynamic	9m 23s
Build RN 0.83.0 legacy hermes ios production static	9m 17s
Build RN 0.83.0 new hermes android production no	6m 52s
Test RN 0.83.0 legacy hermes android production no	7m 12s
Test RN 0.83.0 new hermes android production no	6m 56s
Test RN 0.83.0 legacy hermes ios production no	19m 10s
Test RN 0.83.0 new hermes ios production no	15m 21s
	3h 12m 31s

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