added boolean conversion helper and replaced code in scripts to use it

tests/Get-DSAManifest.Tests.ps1

@@ -8,6 +8,17 @@ $DsaErrors = $null
 $null = [Management.Automation.Language.Parser]::ParseFile($DsaScriptUnderTest, [ref]$DsaTokens, [ref]$DsaErrors)
 If ($DsaErrors.Count) { Throw ($DsaErrors | Out-String) }
 
+# Load only the real conversion helper, without running Tools.ps1 setup.
+$DsaToolsPath = Join-Path (Split-Path $PSScriptRoot -Parent) 'Tools.ps1'
+$DsaToolsAst = [Management.Automation.Language.Parser]::ParseFile($DsaToolsPath, [ref]$DsaTokens, [ref]$DsaErrors)
+If ($DsaErrors.Count) { Throw ($DsaErrors | Out-String) }
+$DsaBooleanDefinition = $DsaToolsAst.Find({
+    param($Node)
+    $Node -is [Management.Automation.Language.FunctionDefinitionAst] -and $Node.Name -eq 'ConvertTo-RmmBoolean'
+}, $true)
+If (!$DsaBooleanDefinition) { Throw 'Missing helper: ConvertTo-RmmBoolean' }
+. ([scriptblock]::Create($DsaBooleanDefinition.Extent.Text))
+
 Function Assert-Dsa { param([bool]$Condition, [string]$Description) If (!$Condition) { Throw $Description } }
 Function Download-File { Throw 'DSA must use Download-FileDirectly.' }
 Function Download-FileDirectly {