Remove dead code related to Jira tracker
Description
After working on !26773 (merged), there are a few methods that we can remove.
Project#jira_tracker
is dead code. We can remove all the code related to that (mainly specs).
Project#jira_tracker_active
is dead code. The only leftover place is reference_issue_tracker
that also looks as dead code.
So, we can review and remove the following methods:
Project#jira_tracker
Project#jira_tracker_active
EE::Project#reference_issue_tracker
Edited by Arturo Herrero