ci: disable parallelism for AzureFunction integration tests

Azure Functions Core Tools (func.exe) crashes (exit code -1) when
multiple instances launch simultaneously, likely due to shared state
in the storage emulator or lock files. Each failure then waits 180s
for an agent log that never appears, cascading into ~15min of wasted
time. Disable parallelism for this namespace until the contention is
resolved.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: tippmar-nr

.github/workflows/all_solutions.yml

@@ -536,11 +536,16 @@ jobs:
 
           Write-Host "Run tests"
 
-          # Parallelization is controlled by workflow input (default: enabled).
-          # Pre-built test apps (NR_DOTNET_TEST_PREBUILT_APPS=1) eliminate the concurrent
-          # dotnet publish file-lock collisions that previously required disabling parallelization.
+          # Most integration tests can run in parallel with pre-built test apps.
+          # Some namespaces must remain serial because they use shared external tools
+          # that don't support concurrent instances (e.g., Azure Functions Core Tools
+          # func.exe crashes when multiple instances launch simultaneously due to shared
+          # state in storage emulator/lock files). To parallelize these, the shared tool
+          # contention would need to be resolved.
+          $noParallelNamespaces = @("AzureFunction")
           $parallelize = "${{ inputs.parallelize_integration_tests }}"
           if ($parallelize -eq "" -or $parallelize -eq "true") { $parallelize = $true } else { $parallelize = $false }
+          if ($noParallelNamespaces -contains "${{ matrix.namespace }}") { $parallelize = $false }
           $json = Get-Content "${{ env.integration_tests_path }}/xunit.runner.json" | ConvertFrom-Json
           $json | Add-Member -Name "parallelizeAssembly" -Value $parallelize -MemberType NoteProperty
           $json | Add-Member -Name "parallelizeTestCollections" -Value $parallelize -MemberType NoteProperty