[release/8.0] [browser] ENVIRONMENT_IS_WEB is also true on WebWorker #91627
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Backport of #91589 to release/8.0
/cc @pavelsavara
Customer Impact
Fixes customer reported issue #91528
When dotnet is started from web worker, it will exit after first async Task/Promise or GC.
Testing
Manual testing and CI
Risk
Corner case use-case fixed.
It may impact multi-threading build which is not supported on Net8 yet.
It should have no impact for Blazor.