fix verbose NativeCommandError formatting in PowerShell test scripts

PowerShell's 2>&1 wraps stderr lines as ErrorRecord objects, which
Out-String formats with full file/line/category info. Pipe through
ForEach-Object { "$_" } to convert them to plain strings first.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: NejcS

test_scripts/run_conformance_tests_cypress.ps1

@@ -140,8 +140,9 @@ try {
     Push-Location $NODE_SUBFOLDER
 
     # Temporarily allow stderr output without throwing (npm may write warnings to stderr)
+    # ForEach-Object converts ErrorRecord objects (from stderr) to plain strings to avoid verbose error formatting
     $ErrorActionPreference = 'Continue'
-    $npmInstallOutput = npm install --prefer-offline --no-audit --no-fund --loglevel error 2>&1 | Out-String
+    $npmInstallOutput = npm install --prefer-offline --no-audit --no-fund --loglevel error 2>&1 | ForEach-Object { "$_" } | Out-String
     $ErrorActionPreference = 'Stop'
     # Filter out noisy npm install lines
     $npmInstallOutput -split "`n" | Where-Object { $_ -notmatch $NPM_INSTALL_OUTPUT_FILTER } | ForEach-Object {
@@ -283,8 +284,9 @@ try {
     Push-Location $NODE_CONFORMANCE_TESTS_SUBFOLDER
 
     # Temporarily allow stderr output without throwing (npm may write warnings to stderr)
+    # ForEach-Object converts ErrorRecord objects (from stderr) to plain strings to avoid verbose error formatting
     $ErrorActionPreference = 'Continue'
-    $npmInstallOutput = npm install cypress --save-dev --prefer-offline --no-audit --no-fund --loglevel error 2>&1 | Out-String
+    $npmInstallOutput = npm install cypress --save-dev --prefer-offline --no-audit --no-fund --loglevel error 2>&1 | ForEach-Object { "$_" } | Out-String
     $ErrorActionPreference = 'Stop'
     $npmInstallOutput -split "`n" | Where-Object { $_ -notmatch $NPM_INSTALL_OUTPUT_FILTER } | ForEach-Object {
         if ($_.Trim()) { Write-Host $_ }
@@ -295,7 +297,7 @@ try {
     }
 
     $ErrorActionPreference = 'Continue'
-    $cypress_info_output = npx cypress info 2>&1 | Out-String
+    $cypress_info_output = npx cypress info 2>&1 | ForEach-Object { "$_" } | Out-String
     $ErrorActionPreference = 'Stop'
     $CYPRESS_BROWSER_FLAG = ""
     if ($cypress_info_output -match "(?i)chrome") {

test_scripts/run_conformance_tests_golang.ps1

@@ -81,8 +81,9 @@ try {
     Write-Host "Running Golang conformance tests...`n"
 
     # Temporarily allow stderr output without throwing (Go may write to stderr)
+    # ForEach-Object converts ErrorRecord objects (from stderr) to plain strings to avoid verbose error formatting
     $ErrorActionPreference = 'Continue'
-    $output = go run "$current_dir/$ConformanceTestsFolder/conformance_tests.go" 2>&1 | Out-String
+    $output = go run "$current_dir/$ConformanceTestsFolder/conformance_tests.go" 2>&1 | ForEach-Object { "$_" } | Out-String
     $exit_code = $LASTEXITCODE
     $ErrorActionPreference = 'Stop'
 

test_scripts/run_conformance_tests_python.ps1

@@ -70,8 +70,9 @@ try {
     Write-Host "Running Python conformance tests...`n"
 
     # Temporarily allow stderr output without throwing (Python unittest writes progress to stderr)
+    # ForEach-Object converts ErrorRecord objects (from stderr) to plain strings to avoid verbose error formatting
     $ErrorActionPreference = 'Continue'
-    $output = & $PYTHON_CMD -m unittest discover -b -s "$current_dir/$ConformanceTestsFolder" 2>&1 | Out-String
+    $output = & $PYTHON_CMD -m unittest discover -b -s "$current_dir/$ConformanceTestsFolder" 2>&1 | ForEach-Object { "$_" } | Out-String
     $exit_code = $LASTEXITCODE
     $ErrorActionPreference = 'Stop'
 

test_scripts/run_unittests_golang.ps1

@@ -48,17 +48,20 @@ Push-Location $GO_BUILD_SUBFOLDER
 try {
     Write-Host "Running go get..."
     # Temporarily allow stderr output without throwing (Go tools write to stderr)
+    # ForEach-Object converts ErrorRecord objects (from stderr) to plain strings to avoid verbose error formatting
     $ErrorActionPreference = 'Continue'
-    go get
+    $output = go get 2>&1 | ForEach-Object { "$_" } | Out-String
     $ErrorActionPreference = 'Stop'
+    if ($output.Trim()) { Write-Host $output }
 
     # Execute all Golang unittests in the subfolder
     Write-Host "Running Golang unittests in $BuildFolder..."
     $ErrorActionPreference = 'Continue'
-    go test
+    $output = go test 2>&1 | ForEach-Object { "$_" } | Out-String
     $exit_code = $LASTEXITCODE
     $ErrorActionPreference = 'Stop'
 
+    Write-Host $output
     exit $exit_code
 } finally {
     Pop-Location

test_scripts/run_unittests_python.ps1

@@ -60,8 +60,9 @@ try {
     Write-Host "Running Python unittests in $PYTHON_BUILD_SUBFOLDER..."
 
     # Temporarily allow stderr output without throwing (Python unittest writes progress to stderr)
+    # ForEach-Object converts ErrorRecord objects (from stderr) to plain strings to avoid verbose error formatting
     $ErrorActionPreference = 'Continue'
-    $output = & $PYTHON_CMD -m unittest discover -b 2>&1 | Out-String
+    $output = & $PYTHON_CMD -m unittest discover -b 2>&1 | ForEach-Object { "$_" } | Out-String
     $exit_code = $LASTEXITCODE
     $ErrorActionPreference = 'Stop'
 

test_scripts/run_unittests_react.ps1

@@ -61,8 +61,9 @@ try {
     # Execute all React unittests in the subfolder
     Write-Host "Running React unittests in $BuildFolder..."
     # Temporarily allow stderr output without throwing (npm/jest may write to stderr)
+    # ForEach-Object converts ErrorRecord objects (from stderr) to plain strings to avoid verbose error formatting
     $ErrorActionPreference = 'Continue'
-    $output = npm test -- --runInBand --silent --detectOpenHandles 2>&1 | Out-String
+    $output = npm test -- --runInBand --silent --detectOpenHandles 2>&1 | ForEach-Object { "$_" } | Out-String
     $TEST_EXIT_CODE = $LASTEXITCODE
     $ErrorActionPreference = 'Stop'