Do not associate jobs for branch names containing the same prefix

[gtsiolis]

Describe the bug
Pushing two branches with the same prefix like gt/test and gt/test-two associates these two jobs.

To Reproduce
Steps to reproduce the behavior:

1. Push a branch named gt/test
2. Push a branch named gt/test-two
3. Go to the job page of the first branch.
4. See the bottom right notification.

Screenshots

Here's a notification at the bottom of the job page of the first branch where the second branch is associated.