Attempting to edit a file from a tag fails with incorrect error message

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Summary

Attempting to edit a file from a tag fails with incorrect error message You can’t edit files directly in this project. Fork this project and submit a merge request with your changes. and shows a button to fork

Steps to reproduce

1. Browse to a tag
2. Select a file
3. Click Edit (doesn't matter if it is open in Web IDE or edit

Example Project

https://gitlab.com/Woodz1/gitlab-bug-repros/-/blob/release/v1.0.2/test.txt#modal-confirm-fork-edit

What is the current bug behavior?

The screen shows ``You can’t edit files directly in this project. Fork this project and submit a merge request with your changes.` and shows a button to fork

What is the expected correct behavior?

Should open the editor/Web IDE to browse the file at the tag

Relevant logs and/or screenshots

Output of checks

This bug happens on GitLab.com

Results of GitLab environment info

Expand for output related to GitLab environment info

(For installations with omnibus-gitlab package run and paste the output of:
`sudo gitlab-rake gitlab:env:info`)

(For installations from source run and paste the output of:
`sudo -u git -H bundle exec rake gitlab:env:info RAILS_ENV=production`)

Results of GitLab application Check

Expand for output related to the GitLab application check

(For installations with omnibus-gitlab package run and paste the output of:
sudo gitlab-rake gitlab:check SANITIZE=true)
(For installations from source run and paste the output of:
sudo -u git -H bundle exec rake gitlab:check RAILS_ENV=production SANITIZE=true)
(we will only investigate if the tests are passing)

Possible fixes