YARN-11873. Add yarn.lock for app catalog webapp (#8020) Contributed by Michael Smith

*Adds a yarn.lock to ensure reproducible npm builds with hadoop-yarn-applications-catalog-webapp.

Signed-off-by: Shilun Fan <[email protected]>

Author: MikaelSmith

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-applications-catalog/hadoop-yarn-applications-catalog-webapp/.gitignore

@@ -2,4 +2,3 @@
 .project
 /target/
 /node_modules/
-yarn.lock