View Issue: edit elements should be changed from span to button

Issue Summary

At the moment, the edit elements are <span>s with role="button", they should be changed to native <button> elements. Beware, this might lead to some broken tests.

This is reproducible on Data Center: yes

Steps to Reproduce

1. Go to the View Issue page, e.g. https://jira.atlassian.com/browse/JRASERVER-73274
2. Observe the edit elements that appear on hover or when you navigate with a keyboard

Expected Results

The edit elements should be native buttons

Actual Results

The edit elements are spans

Workaround

Spans with role="button" work pretty well