Add Ubuntu-Slim image definition (#13423)

Add ubuntu-slim image definition

images/ubuntu-slim/scripts/docs-gen/SoftwareReport.Helpers.psm1

@@ -0,0 +1,37 @@
+function Get-StringPart {
+    param (
+        [Parameter(ValueFromPipeline)]
+        [string] $ToolOutput,
+        [string] $Delimiter = " ",
+        [int[]] $Part
+    )
+
+    $parts = $ToolOutput.Split($Delimiter, [System.StringSplitOptions]::RemoveEmptyEntries)
+    $selectedParts = $parts[$Part]
+    return [string]::Join($Delimiter, $selectedParts)
+}
+
+function Get-PathWithLink {
+    param (
+        [string] $InputPath
+    )
+
+    $link = Get-Item $InputPath | Select-Object -ExpandProperty Target
+    if (-not [string]::IsNullOrEmpty($link)) {
+      return "${InputPath} -> ${link}"
+    }
+    return "${InputPath}"
+}
+
+function Get-OSVersionShort {
+    $(Get-OSVersionFull) | Get-StringPart -Delimiter '.' -Part 0,1
+}
+
+function Get-OSVersionFull {
+    lsb_release -ds | Get-StringPart -Part 1, 2
+}
+
+function Get-KernelVersion {
+    $kernelVersion = uname -r
+    return $kernelVersion
+}