disable on_demand_gc until AOT issues are identified

[lewing]

We enabled on_demand_gc in .NET 6 with #29098. Wasm AOT'd e3e benchmarks are seeing errors that appear to go away with on_demand_gc disabled

dotnet/runtime#51319

Staging this for preview 4 while we work the issue.

[lewing]

Failure is RendersAuthorizingUntilAuthorizationCompletedAsync, it was added in #31794 and unlikely to be related to this change.

[captainsafia]

cc: @jkotalik for potential flake

[jkotalik]

@HaoK can you tell me if the failure on RendersAuthorizingUntilAuthorizationCompletedAsync is a pressing issue that needs to be fixed? I see the test was just merged this morning.

I'll mark it as quarantined anyways but considering it was a just added test, I want to make sure we didn't merge something that caused a regression.

[jkotalik]

System.InvalidOperationException : Sequence contains more than one element

 at System.Linq.ThrowHelper.ThrowMoreThanOneElementException()
   at System.Linq.Enumerable.TryGetSingle[TSource](IEnumerable`1 source, Boolean& found)
   at System.Linq.Enumerable.Single[TSource](IEnumerable`1 source)
   at Microsoft.AspNetCore.Components.Authorization.AuthorizeViewTest.RendersAuthorizingUntilAuthorizationCompletedAsync() in /_/src/Components/Authorization/test/AuthorizeViewTest.cs:line 318

[HaoK]

Yeah it was just added, don't think it will be related

[ghost]

Hello @captainsafia!

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