Add region to artifact name (#1110)

*Issue #, if available:*
Lambda layer release is currently failing due to a bug.
Fix from this PR:
https://github.com/aws-observability/aws-otel-dotnet-instrumentation/pull/170/files

By submitting this pull request, I confirm that my contribution is made
under the terms of the Apache 2.0 license.

Author: harrryr

.github/workflows/release-lambda.yml

@@ -141,7 +141,7 @@ jobs:
         if: ${{ success() }}
         uses: actions/upload-artifact@v4
         with:
-          name: ${{ env.LAYER_NAME }}
+          name: ${{ env.LAYER_NAME }}-${{ matrix.aws_region }}
           path: ${{ env.LAYER_NAME }}/${{ matrix.aws_region }}
 
       - name: clean s3