Consistent and idiomatic casing/formatting. (#33362)

activate.ps1

@@ -8,7 +8,6 @@ if ($MyInvocation.InvocationName -ne '.') {
 }
 
 function deactivate ([switch]$init) {
-
     # reset old environment variables
     if (Test-Path variable:_OLD_PATH) {
         $env:PATH = $_OLD_PATH
@@ -16,12 +15,12 @@ function deactivate ([switch]$init) {
     }
 
     if (test-path function:_old_prompt) {
-        Set-Item Function:prompt -Value $function:_old_prompt -ea ignore
-        remove-item function:_old_prompt
+        Set-Item Function:prompt -Value $function:_old_prompt -ErrorAction Ignore
+        Remove-Item function:_old_prompt
     }
 
-    Remove-Item env:DOTNET_ROOT -ea ignore
-    Remove-Item env:DOTNET_MULTILEVEL_LOOKUP -ea ignore
+    Remove-Item env:DOTNET_ROOT -ErrorAction Ignore
+    Remove-Item env:DOTNET_MULTILEVEL_LOOKUP -ErrorAction Ignore
     if (-not $init) {
         # Remove the deactivate function
         Remove-Item function:deactivate
@@ -44,11 +43,11 @@ if (-not $env:DISABLE_CUSTOM_PROMPT) {
     $function:_old_prompt = $function:prompt
     function dotnet_prompt {
         # Add a prefix to the current prompt, but don't discard it.
-        write-host -f Green "($( split-path $PSScriptRoot -leaf )) " -nonewline
+        Write-Host -f Green "($(Split-Path $PSScriptRoot -Leaf)) " -NoNewLine
         & $function:_old_prompt
     }
 
-    Set-Item Function:prompt -Value $function:dotnet_prompt -ea ignore
+    Set-Item Function:prompt -Value $function:dotnet_prompt -ErrorAction Ignore
 }
 
 Write-Host -f Magenta "Enabled the .NET Core environment. Execute 'deactivate' to exit."