Remove misc_scripts/jira/*

Created by: mkszuba

Description

Remove the script which used to be used to create Core release tasks on Jira.

Use case

The script is not used any more + is at least partly out of date.

Benefits

Less cruft in the repository.

Possible Drawbacks

None.

Testing

Have you added/modified unit tests to test the changes?

No, the script in question has not been covered by the test suite.

If so, do the tests pass/fail?

N/A

Have you run the entire test suite and no regression was detected?

Yes, no regression detected.