Parameterize and add diagnostics to InsertVersionsValues.ps1

It's been failing ever since switching from `Get-Nbgv.ps1` to `dotnet tool run nbgv`, but only on Azure Pipelines, and only on certain commits. Quite literally, it fails repeatedly on some particular commit, and if I push a new *empty* commit, it succeeds. This makes me believe that somehow, the git database or git commit id itself or something is causing `nbgv` to fail. I have no idea why it would fail with this output though:

```
Computing InsertVersionsValues variable
Option '--project' expects a single argument but 2 were provided.

ConvertFrom-Json: /home/vsts/work/1/s/azure-pipelines/variables/InsertVersionsValues.ps1:2
Line |
   2 |  … oft.VisualStudio.Validation" --format json | ConvertFrom-Json).Assemb …
     |                                                 ~~~~~~~~~~~~~~~~
     | Conversion from JSON failed with error: Unexpected character encountered
     | while parsing value: D. Path '', line 0, position 0.
```

The output suggests a malformed command line, but I simply see no possible way for that to happen. Nor can I repro it locally.

azure-pipelines/variables/InsertVersionsValues.ps1

@@ -4,6 +4,30 @@
 # your libraries as defined in the src\ProductData\AssemblyVersions.tt file.
 return
 
-[string]::join(',',(@{
-    ('LibraryNoDotsVersion') = & { (dotnet tool run nbgv get-version --project "$PSScriptRoot\..\..\src\LibraryName" --format json | ConvertFrom-Json).AssemblyVersion };
-}.GetEnumerator() |% { "$($_.key)=$($_.value)" }))
+$MacroName = 'LibraryNoDotsVersion'
+$SampleProject = "$PSScriptRoot\..\..\src\LibraryName"
+try {
+    return [string]::join(',',(@{
+        ($MacroName) = & { (dotnet tool run nbgv get-version --project $SampleProject --format json | ConvertFrom-Json).AssemblyVersion };
+    }.GetEnumerator() |% { "$($_.key)=$($_.value)" }))
+}
+catch {
+    Write-Error $_
+    Write-Error "Failed. Diagnostic data proceeds:"
+    [string]::join(',',(@{
+        ($MacroName) = & {
+            Write-Host "dotnet tool run nbgv get-version --project `"$SampleProject`" --format json"
+            $result1 = dotnet tool run nbgv get-version --project $SampleProject --format json
+            Write-Host $result1
+            $result2 = dotnet tool run nbgv get-version --project $SampleProject --format json | ConvertFrom-Json
+            Write-Host $result2
+            Write-Host $result2.AssemblyVersion
+            Write-Host (dotnet tool run nbgv get-version --project $SampleProject --format json | ConvertFrom-Json).AssemblyVersion
+            Write-Output (dotnet tool run nbgv get-version --project $SampleProject --format json | ConvertFrom-Json).AssemblyVersion
+        };
+    }.GetEnumerator() |% { "$($_.key)=$($_.value)" }))
+
+    Write-Host "one more..."
+    $r = & { (dotnet tool run nbgv get-version --project $SampleProject --format json | ConvertFrom-Json).AssemblyVersion };
+    Write-Host $r
+}