<flat_map>: Re-enable /permissive with miscellaneous fixes and test coverage
#4386
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Towards #2910. Addresses some comments in #4337.
Product code fixes for
<flat_map>._EXPORT_STD._Flat_map_base._NODISCARDand_NODISCARD_FRIEND.typenamein the namespace scope./permissivemode by changing_Insert_exactcalls._Insert_exactin the future._Erase_if._STL_INTERNAL_STATIC_ASSERT.Test coverage for modules with
<flat_map>.Test coverage unique to
<flat_map>.this->templatetest coverage./permissive.