STAThreadAttribute is unnecessarily being left in a Blazor WASM default app

[eerhardt]

When publishing a Blazor WASM app, the STAThreadAttribute type is being left in the published app.

We should trim this attribute in a WASM app, as it doesn't serve a purpose.

Tagging subscribers to 'size-reduction': @eerhardt, @SamMonoRT, @marek-safar, @tannergooding
See info in area-owners.md if you want to be subscribed.

Issue Details

---

When publishing a Blazor WASM app, the STAThreadAttribute type is being left in the published app.

We should trim this attribute in a WASM app, as it doesn't serve a purpose.

Author:	eerhardt
Assignees:	tannergooding
Labels:	area-System.Runtime, size-reduction
Milestone:	-

[marek-safar]

I think this is a subset of whole COM removal work #36659

[eerhardt]

We should be able to do this individually without doing the rest of the COM work.

[marek-safar]

Sure, just saying this is not WASM specific but COM related so any e.g. Linux app could win

[SamMonoRT]

@tannergooding - any update on this one - Is this going to be in for .NET6 ? Please update the milestone accordingly and remove the untriaged label.

[SamMonoRT]

@tannergooding - setting this for 6.0.0 - please update it.