Add bsl_once
[APPROVAL] INTERNAL undef-P7-in-bdldfp-drqs-57209949 to master

Base commit: 179bd3254d81fb5301ede8631dd56a918bf4d5f6
[APPROVAL] INTERNAL pending/master/resolve_ambiguous_assign_drqs57251422 to master

Base commit: d1e6a5d5728c3246c3354d5a7957b2b29b1ed7ef
Fix negative test case
[APPROVAL] INTERNAL remove-binary-status-flag-drqs-57413426 to releases/2.22.x

Base commit: d1aee6509a629c75b02b83907507a2342b0b6853
[APPROVAL] INTERNAL add-inline-to-assign-stringref-drqs-57553745 to releases/2.22.x

Base commit: 612af51b1b00f1b2c99d3cd78251462a448db740
[APPROVAL] review/decimal-omnibus-merge to releases/2.22.x

Conflicts:
	groups/bdl/bdl+inteldfp/package/bdl+inteldfp.opts
[APPROVAL] remove-want-decfp-drqs-55534214 to releases/2.22.x
[APPROVAL] pending/master/fix-osx-build-bdeut_stringref-drqs58086499 to releases/2.22.x
Apply Jeff's 1st round review comments.
Synch up bsls_bslonce usage test
[APPROVAL] pending/master/decimal-omnibus-merge to releases/2.22.x
Remove unnecessary stdint.h
[APPROVAL] missing-bdl-include-drqs58266540 to releases/2.22.x
[APPROVAL] INTERNAL rebased-string_patches_for_windows_2_22_kit_drqs58247801 to releases/2.22.x

Base commit: 688d65a1d0003e9dca15f2d28686ccf319c06554
[APPROVAL] INTERNAL review/doc_bug_in_managed_ptr_drqs55675623 to releases/2.22.x

Base commit: beaca90f7614c29ce34a2e7717f8a721110e02af
[APPROVAL] INTERNAL review/synopses-and-doxygen-2.22-drqs-57987951 to releases/2.22.x

Base commit: b3de9af206dffb176d7883cdb929e7ad32b37a87
[APPROVAL] INTERNAL review/make_shared_should_not_default_construct_drqs58210637 to releases/2.22.x

Base commit: c92c68aa3fdf9fdcabed9ff3722d42dae4fae1d0
[APPROVAL] INTERNAL review/merge-base-rebase-bdldfp-missing-include-drqs57022994 to releases/2.22.x

Base commit: badae8705bda12617fc78d37aeade9309793b358
Remove -DBSL_OVERRIDES_STD from bsl.defs

BSL_OVERRIDES_STD imports bsl headers to the std namespace and should be
used only internally for backwards compatibility with the existing
source code. We are removing BSL_OVERRIDES_STD from bsl.defs so that it
is no longer the default.