Parallelize static web assets compression

[cl0ckt0wer]

Summary

• make Static Web Assets cache manifest writes resilient to concurrent readers/writers
• add a bounded parallelism knob for gzip and Brotli static web asset compression
• preserve existing Brotli compression-level properties while adding StaticWebAssetsBrotliCompressionLevel
• make the Static Web Assets Brotli tool fail when any file compression fails

Related to dotnet/aspnetcore#64352.

Testing

• ./build.cmd -projects test/Microsoft.NET.Sdk.StaticWebAssets.Tests/Microsoft.NET.Sdk.StaticWebAssets.Tests.csproj
• ./.dotnet/dotnet.exe test test/Microsoft.NET.Sdk.StaticWebAssets.Tests/Microsoft.NET.Sdk.StaticWebAssets.Tests.csproj --no-build --filter FullyQualifiedName~CompressionTasksTest
• ./.dotnet/dotnet.exe test test/Microsoft.NET.Sdk.StaticWebAssets.Tests/Microsoft.NET.Sdk.StaticWebAssets.Tests.csproj --no-build --filter FullyQualifiedName~DefineStaticWebAssetsCache_CanHandleConcurrentWriters
• ./.dotnet/dotnet.exe test test/Microsoft.NET.Sdk.StaticWebAssets.Tests/Microsoft.NET.Sdk.StaticWebAssets.Tests.csproj --no-build --filter FullyQualifiedName~DefineStaticWebAssetsCache_CanReplaceManifestWhileReadersShareDelete
• ./build.cmd -projects src/StaticWebAssetsSdk/Tool/Microsoft.NET.Sdk.StaticWebAssets.Tool.csproj
• Static Web Assets tool smoke tested invalid max degree of parallelism and missing source-file failures return non-zero

[dotnet-policy-service]

Thanks for your PR, @cl0ckt0wer.
To learn about the PR process and branching schedule of this repo, please take a look at the SDK PR Guide.

[cl0ckt0wer]

@dotnet-policy-service agree

[cl0ckt0wer]

Hi team, thanks for taking the time out of your day to work on this. I've been running a lot of builds locally and this would save a lot of frustration. So here's the analysis of the failures:

• linux x64 TestBuild failed copying Microsoft.TemplateEngine.Utils.dll due to an IOException/file-in-use error in Microsoft.Common.CurrentVersion.targets.
• macOS arm64 TestBuild failed a Helix work item for Microsoft.CodeAnalysis.NetAnalyzers.UnitTests with 0 tests executed under the selected filter.

Neither failure appears to involve Static Web Assets or the compression changes in this PR. Could someone please rerun the failed legs?