Flag cleanup

Remove code references for launched android.os.Flags.allowPrivateProfile
and android.multiuser.Flags.enablePrivateSpaceFeatures flags in
packages/apps/Settings.

NO_IFTTT=flag cleanup, no changes to api

Bug: 409611302, 409610159
Flag: EXEMPT flag cleanup
Test: presubmit
Change-Id: Iac9a96039f904f9db498f98350d45dfdc356e087
36 files changed