Merged PR 13221710: explicit not use rustup

copilot messed up my script last PR, the `return` exited the script so nothing got built.  instead, just going to wrap use of `rustup` to check if running in ADO.  Can't run it because it won't auth and MSAzure doesn't allow public feeds, but the rust installer task already set it up as needed anyways.

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#### AI description  (iteration 1)
#### PR Classification
Build script update.

#### PR Summary
This PR modifies the build script to conditionally bypass rustup commands when the `$usingADO` flag is set, ensuring that rustup is only used in non-ADO environments.
- `build.ps1`: Wraps the rustup default command in a condition checking `$usingADO`.
- `build.ps1`: Adds a condition to the rustup target addition so it executes only when the architecture is not 'Current' and `$usingADO` is false.
<!-- GitOpsUserAgent=GitOps.Apps.Server.pullrequestcopilot -->

Author: SteveL-PowerShell

build.ps1

@@ -193,7 +193,9 @@ if ($null -ne $packageType) {
 
     $BuildToolsPath = "${env:ProgramFiles(x86)}\Microsoft Visual Studio\2022\BuildTools\VC\Tools\MSVC"
 
-    & $rustup default stable
+    if (!$usingADO) {
+        & $rustup default stable
+    }
 
     ## Test if Node is installed
     ## Skipping upgrade as users may have a specific version they want to use
@@ -262,7 +264,7 @@ else {
 }
 
 if (!$SkipBuild) {
-    if ($architecture -ne 'Current') {
+    if ($architecture -ne 'Current' -and !$usingADO) {
         & $rustup target add --toolchain $channel $architecture
     }