… try. (dotnet#112809)

* Use FLS detach as thread termination notification on windows.

* use _ASSERTE_ALL_BUILDS

* one more case

* InitFlsSlot throws per convention used in threading initialization

* OsDetachThread could be void

* Update src/coreclr/vm/ceemain.cpp

* ensure CoInitialize

* Asserts to fail deterministically.

* comments

* scope the failfast to Windows and tweak the comments a bit.

* better assert

* Apply suggestions from code review

Co-authored-by: Jan Kotas <jkotas@microsoft.com>

* Undo unnecessary finalizer thread changes

* reverse the failfast condition

* handle destruction of unattached threads

* PR feedback

Co-authored-by: Jan Kotas <jkotas@microsoft.com>

* Update src/coreclr/vm/ceemain.cpp

* set g_fComStarted as soon as we call CoInitialize

* Naming nit

* fix a typpo + better comment

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Co-authored-by: Jan Kotas <jkotas@microsoft.com>

VSadov deleted the backport112809 branch

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