Fix github workflow to correctly pass the release tag name (#2533)

Author: achyutjhunjhunwala

.github/workflows/build_ecs_typescript.yml

@@ -17,4 +17,4 @@ jobs:
           -H "Authorization: Bearer ${{ secrets.ECS_TYPESCRIPT_REPO_TRIGGER_KEY }}" \
           -H "X-GitHub-Api-Version: 2022-11-28" \
             https://api.github.com/repos/elastic/ecs-typescript/actions/workflows/generate.yml/dispatches \
-          -d '{"ref":"main","inputs":{"ecsRef":"${{ env.RELEASE_VERSION }}"}}'
+          -d '{"ref":"main","inputs":{"ecsRef":"${{ github.event.release.tag_name }}"}}'