[sys-6435] make DeleteLocalInvisibleFiles public #298
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This is to help with #sys-6435, in which live mount replicas never purge local manifest files.
My plan is to call
DeleteLocalInvisibleFilesafter follower applieskNewEpoch. This will delete both invisible MANIFEST and CLOUDMANIFEST files. NOTE that there is only one single CLOUDMANFIEST file locally since we never override the one in local disk once it's loaded. Also It's ok to delete local CLOUDMANIFEST files with live db. We only read it when opening rocksdb.