v23/internal/test/release: write manifest snapshot target to a file
v23/internal/test/release: write manifest snapshot target to a file

The content of that file will be used as a parameter to trigger test+deploy
jobs

Change-Id: Ie09ada8d3186294b7baf54a448360a5bda4ad6b9

vanadium/go.devtools,vanadium/go.devtools,vanadium/go.devtools