[stdlib] Addressing Fixme comment atomic stdlib unit test flags (#23198)
[stdlib] Addressing Fixme comment atomic stdlib unit test flags (#23198)

* Addressing FIXME comment making StdlibUnittest flags atomic

* Commenting store

* Fix wrong change

* Add comment

* Addressing the PR comment suggestions.

* Remove public wrong place.

* Reverting comment iff

* Update stdlib/private/StdlibUnittest/StdlibUnittest.swift

Co-Authored-By: LucianoPAlmeida <9767f571e19c40793f8f4058b9f4b5db58a2b35c@outlook.com>

* File private vars

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