Bump MSTest.TestAdapter from 3.3.1 to 3.4.0 in /src/vs-bicep #32695

Job	Run time
Build CLI (win-x64)	8m 55s
Build CLI (linux-x64)	8m 49s
Build CLI (linux-musl-x64)	8m 55s
Build NuGet Packages	3m 57s
Build CLI (osx-x64)	8m 59s
Build CLI (linux-arm64)	9m 3s
Build CLI (win-arm64)	8m 58s
Build: VSCode Extension	8m 3s
Build CLI (osx-arm64)	9m 25s
Build Visual Studio Extension	25m 16s
Build Highlight Libraries	4m 51s
Build Playground	5m 23s
Check secret access	3s
Test Dotnet (windows-latest) (Core)	4m 30s
Test Dotnet (ubuntu-latest) (Core)	3m 9s
Test Dotnet (windows-latest) (LangServer)	5m 25s
Test Dotnet (ubuntu-latest) (LangServer)	4m 23s
Test Dotnet (windows-latest) (Others)	5m 23s
Test Dotnet (ubuntu-latest) (Others)	4m 0s
PR Comment: Dotnet Tests Summary	16s
Test: VSCode Extension (windows-latest, true)	6m 55s
Test: VSCode Extension (ubuntu-latest, true)	4m 27s
Build Windows Setup	1m 27s
Build CLI NuGet Packages (win-x64)	4m 3s
Build CLI NuGet Packages (linux-x64)	2m 28s
Build CLI NuGet Packages (osx-x64)	5m 16s
Build CLI NuGet Packages (win-arm64)	57s
Build CLI NuGet Packages (linux-arm64)	36s
PR Comment: Preview Links	5s
Build CLI NuGet Packages (osx-arm64)	40s
Test CLI (e2e) (win-x64)	1m 6s
Test CLI (e2e) (linux-x64)	53s
Test CLI (live) (win-x64) (prod)	3m 28s
Test CLI (e2e) (linux-musl-x64)	1m 8s
Test CLI (live) (linux-musl-x64) (prod)	2m 9s
Test CLI (live) (linux-x64) (prod)	1m 45s
Test CLI (e2e) (osx-x64)	59s
Test CLI (live) (osx-x64) (prod)	2m 24s
Test CLI (live) (linux-musl-x64) (ff)	1m 52s
Test CLI (live) (win-x64) (ff)	2m 56s
Test CLI (live) (linux-x64) (ff)	1m 58s
Test CLI (live) (osx-x64) (ff)	3m 48s
	3h 9m 3s

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