[release/9.0] Switch to new long-term paths (#15636)

Co-authored-by: Rich Lander <[email protected]>

Author: akoeplinger

eng/common/tools.ps1

@@ -42,7 +42,7 @@
 [bool]$useInstalledDotNetCli = if (Test-Path variable:useInstalledDotNetCli) { $useInstalledDotNetCli } else { $true }
 
 # Enable repos to use a particular version of the on-line dotnet-install scripts.
-#    default URL: https://dotnet.microsoft.com/download/dotnet/scripts/v1/dotnet-install.ps1
+#    default URL: https://builds.dotnet.microsoft.com/dotnet/scripts/v1/dotnet-install.ps1
 [string]$dotnetInstallScriptVersion = if (Test-Path variable:dotnetInstallScriptVersion) { $dotnetInstallScriptVersion } else { 'v1' }
 
 # True to use global NuGet cache instead of restoring packages to repository-local directory.
@@ -262,7 +262,7 @@ function GetDotNetInstallScript([string] $dotnetRoot) {
   if (!(Test-Path $installScript)) {
     Create-Directory $dotnetRoot
     $ProgressPreference = 'SilentlyContinue' # Don't display the console progress UI - it's a huge perf hit
-    $uri = "https://dotnet.microsoft.com/download/dotnet/scripts/$dotnetInstallScriptVersion/dotnet-install.ps1"
+    $uri = "https://builds.dotnet.microsoft.com/dotnet/scripts/$dotnetInstallScriptVersion/dotnet-install.ps1"
 
     Retry({
       Write-Host "GET $uri"

eng/common/tools.sh

@@ -54,7 +54,7 @@ warn_as_error=${warn_as_error:-true}
 use_installed_dotnet_cli=${use_installed_dotnet_cli:-true}
 
 # Enable repos to use a particular version of the on-line dotnet-install scripts.
-#    default URL: https://dotnet.microsoft.com/download/dotnet/scripts/v1/dotnet-install.sh
+#    default URL: https://builds.dotnet.microsoft.com/dotnet/scripts/v1/dotnet-install.sh
 dotnetInstallScriptVersion=${dotnetInstallScriptVersion:-'v1'}
 
 # True to use global NuGet cache instead of restoring packages to repository-local directory.
@@ -295,7 +295,7 @@ function with_retries {
 function GetDotNetInstallScript {
   local root=$1
   local install_script="$root/dotnet-install.sh"
-  local install_script_url="https://dotnet.microsoft.com/download/dotnet/scripts/$dotnetInstallScriptVersion/dotnet-install.sh"
+  local install_script_url="https://builds.dotnet.microsoft.com/dotnet/scripts/$dotnetInstallScriptVersion/dotnet-install.sh"
 
   if [[ ! -a "$install_script" ]]; then
     mkdir -p "$root"