Hide buttons for the group of deploys for the same revision

Summary

Rollback button is shown for the same revision as the Re-deploy button, semantically, it's in fact a Re-deploy instead of a rollback, this could lead to misinformation and mistakenly be rollbacking the same revision

Steps to reproduce

Re-Deploy two or more times in an environment, the Rollback button is shown for the same revision

What is the expected correct behavior?

hide action buttons "Rollback/Re-Deploy" for the same version deployed many times

Current Expected

Results of GitLab environment info

System information
System:		Ubuntu 16.04
Current User:	git
Using RVM:	no
Ruby Version:	2.3.5p376
Gem Version:	2.6.13
Bundler Version:1.13.7
Rake Version:	12.0.0
Redis Version:	3.2.5
Git Version:	2.13.5
Sidekiq Version:5.0.4
Go Version:	unknown
GitLab information
Version:	10.0.3
Revision:	8895150
Directory:	/opt/gitlab/embedded/service/gitlab-rails
DB Adapter:	postgresql
URL:		http://OUR-HOSTNAME
HTTP Clone URL:	http://OUR-HOSTNAME/some-group/some-project.git
SSH Clone URL:	git@OUR-HOSTNAME:some-group/some-project.git
Using LDAP:	no
Using Omniauth:	no
GitLab Shell
Version:	5.9.0
Repository storage paths:

• default: /var/opt/gitlab/git-data/repositories
• storage1: /mnt/gitlab/git-data/repositories Hooks: /opt/gitlab/embedded/service/gitlab-shell/hooks Git: /opt/gitlab/embedded/bin/git

Possible fixes

Hide buttons for the group of deploys for the same revision