Revert "Set dotnet_cli_home to reporoot instead of relying in azdo va…

…riables to fix local build and docker scenarios (#5805)" (#5815)

This reverts commit 04a4104.

eng/common/tools.ps1

@@ -114,10 +114,10 @@ function InitializeDotNetCli([bool]$install, [bool]$createSdkLocationFile) {
 
   # On CI:
   # Disable telemetry
-  # Set the CLI home directory to the repo root.
+  # Set the CLI home directory to the build machine's workspace.
   if ($ci) {
     $env:DOTNET_CLI_TELEMETRY_OPTOUT=1
-    $env:DOTNET_CLI_HOME=$RepoRoot
+    $env:DOTNET_CLI_HOME=$env:AGENT_BUILDDIRECTORY
   }
 
   # Source Build uses DotNetCoreSdkDir variable

eng/common/tools.sh

@@ -112,10 +112,10 @@ function InitializeDotNetCli {
 
   # On CI:
   # Disable telemetry
-  # Set the CLI home directory to the repo root.
+  # Set the CLI home directory to the build machine's workspace.
   if [[ $ci == true ]]; then
     export DOTNET_CLI_TELEMETRY_OPTOUT=1
-    export DOTNET_CLI_HOME=$repo_root
+    export DOTNET_CLI_HOME=$AGENT_BUILDDIRECTORY
   fi
 
   # LTTNG is the logging infrastructure used by Core CLR. Need this variable set