Remove unused JavaScript partial

This partial was introduced a few years ago, with:

- Commit: https://gitlab.com/gitlab-org/gitlab-foss/-/commit/e293ffd48fb16c8ad15c066cfbbe1dcead7c52e0
- MR: https://dev.gitlab.org/gitlab/gitlabhq/-/merge_requests/1990

Later it was refactored then and is unused since:

- https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/5995

Actually funnily enough the MR that refactors the code was created
_before_ the security MR at the time.

app/views/import/bitbucket/deploy_key.js.haml

-:plain
-  job = $("tr#repo_#{@repo_id}")
-  job.find(".import-actions").html("<p class='alert alert-danger'>#{_('Access denied! Please verify you can add deploy keys to this repository.')}</p>")

locale/gitlab.pot

@@ -1736,9 +1736,6 @@ msgstr ""
 msgid "Access denied for your LDAP account."
 msgstr ""
 
-msgid "Access denied! Please verify you can add deploy keys to this repository."
-msgstr ""
-
 msgid "Access denied: %{error}"
 msgstr ""