Release notes button on tags page is confusing

Summary

From @patrikhuber in https://gitlab.com/gitlab-org/gitlab-ce/issues/56969:

The Tags page has a button "Release notes", which makes the whole thing really confusing... Tags page, Releases page... two sets of release notes? Some releases displayed on one page but not on the other... pure confusion from a user's perspective.

Proposal

Remove the Edit Release Notes icon and Release Notes Box from the Tags Form