Update repo root relative path in build.cmd and build.sh (#33178)

Addresses #33177

src/FileProviders/Embedded/build.cmd

@@ -1,3 +1,3 @@
 @ECHO OFF
-SET RepoRoot=%~dp0..\..
+SET RepoRoot=%~dp0..\..\..
 %RepoRoot%\eng\build.cmd -projects %~dp0**\*.*proj %*

src/FileProviders/Embedded/build.sh

@@ -3,5 +3,5 @@
 set -euo pipefail
 
 DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
-repo_root="$DIR/../.."
+repo_root="$DIR/../../.."
 "$repo_root/eng/build.sh" --projects "$DIR/**/*.*proj" "$@"