gracefully handle if servermanager not present (#436)

# Description
This pull request updates the `Get-EnvironmentRole` function in
`src/modules/SdnDiag.Utilities.psm1` to handle scenarios where the
`Get-WindowsFeature` cmdlet may not be available. The change ensures
that the function gracefully handles environments lacking this cmdlet by
returning a default value.

### Key changes:

* **Improved error handling for `Get-WindowsFeature`:**
- Added a check using `Get-Command` to verify the existence of the
`Get-WindowsFeature` cmdlet before attempting to use it. If the cmdlet
does not exist, the function now returns the default array `@('Common')`
without attempting further operations.

# Change type
- [x] Bug fix (non-breaking change)
- [ ] Code style update (formatting, local variables)
- [ ] New Feature (non-breaking change that adds new functionality
without impacting existing)
- [ ] Breaking change (fix or feature that may cause functionality
impact)
- [ ] Other

# Checklist:
- [x] My code follows the style and contribution guidelines of this
project.
- [x] I have tested and validated my code changes.

Author: arudell

src/modules/SdnDiag.Utilities.psm1

@@ -2883,8 +2883,15 @@ function Get-EnvironmentRole {
     $array = @('Common')
 
     try {
-        $featuresInstalled = Get-WindowsFeature | Where-Object {$_.Installed -ieq $true}
-        if ($null -eq $featuresInstalled) {
+        # due to some weird functionality in the Get-WindowsFeature cmdlet, we need to check to see if the cmdlet exists
+        # and if it does, we will check to see if the features are installed
+        if (Get-Command -Name Get-WindowsFeature -ErrorAction Ignore) {
+            $featuresInstalled = Get-WindowsFeature -ErrorAction Ignore | Where-Object {$_.Installed -ieq $true}
+            if ($null -eq $featuresInstalled) {
+                return $array
+            }
+        }
+        else {
             return $array
         }