CI Update - Copy System.Threading.Tasks.Extensions.dll from dependencies to dotnet-plat-ext-1.0, 1.1, and 2.0

[gewarren]

Build.Reason:Manual by Genevieve Warren
Build.Url:https://apidrop.visualstudio.com/Content%20CI/_build/results?buildId=350778&view=results
source_repo.branch:system-threading-tasks-extensions
source_repo.url:https://apidrop.visualstudio.com/_git/binaries

Replaces #8841

Adds APIs from System.Threading.Tasks.Extensions.dll to the .NET Platform Extensions monikers for 1.0, 1.1, and 2.0.

[ghost]

I couldn't figure out the best area label to add to this PR. If you have write-permissions please help me learn by adding exactly one area label.

[ghost]

Tagging subscribers to this area: @dotnet/area-system-threading-tasks
See info in area-owners.md if you want to be subscribed.

Issue Details

---

Build.Reason:Manual by Genevieve Warren
Build.Url:https://apidrop.visualstudio.com/Content%20CI/_build/results?buildId=350778&view=results
source_repo.branch:system-threading-tasks-extensions
source_repo.url:https://apidrop.visualstudio.com/_git/binaries

Replaces #8841

Author:	gewarren
Assignees:	gewarren
Labels:	area-System.Threading.Tasks
Milestone:	-

[learn-build-service-prod]

Learn Build status updates of commit 889d8e2:

✅ Validation status: passed

File	Status	Preview URL	Details
xml/FrameworksIndex/dotnet-plat-ext-1.0.xml	✅Succeeded
xml/FrameworksIndex/dotnet-plat-ext-1.1.xml	✅Succeeded
xml/FrameworksIndex/dotnet-plat-ext-2.0.xml	✅Succeeded
xml/System.Collections.Generic/CollectionExtensions.xml	✅Succeeded	View
xml/System.Net.Http.Json/HttpContentJsonExtensions.xml	✅Succeeded	View
xml/System.Numerics/Vector.xml	✅Succeeded	View
xml/System.Runtime.CompilerServices/AsyncMethodBuilderAttribute.xml	✅Succeeded	View
xml/System.Runtime.CompilerServices/AsyncValueTaskMethodBuilder`1.xml	✅Succeeded	View
xml/System.Runtime.CompilerServices/ConfiguredValueTaskAwaitable`1.xml	✅Succeeded	View
xml/System.Runtime.CompilerServices/ConfiguredValueTaskAwaitable`1+ConfiguredValueTaskAwaiter.xml	✅Succeeded	View
xml/System.Runtime.CompilerServices/ValueTaskAwaiter`1.xml	✅Succeeded	View
xml/System.Runtime.Intrinsics/Vector256.xml	✅Succeeded	View
xml/System.Text.Json/JsonSerializer.xml	✅Succeeded	View
xml/System.Threading.Tasks/ValueTask`1.xml	✅Succeeded	View
xml/System/MemoryExtensions.xml	✅Succeeded	View

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[gewarren]

This isn't correct. I'll try again with the assets from the NuGet package.