Clarify outcome of "resolve threads in new issue" buttons in MRs

This is an actionable insight from the UX Department: MRs experience async critique research (insight).

What

The Resolve thread in new issue buttons in merge requests, present in multiple locations, are not clear in their outcomes:

1. Will this button auto-resolve the unresolved threads?
2. Does it create one issue for all threads? Or one issue for each thread?

Why

This lack of clarity makes users hesitate to use these buttons and difficult for users to understand what will happen.

How

Reword the button labels/tooltips to clarify the outcome of "resolve threads in new issue" buttons.

• From Resolve all threads in new issue to Create issue to resolve all threads
• From Resolve this thread in a new issue to Create issue to resolve thread

Follow-up

Consider changing the terminology from unresolved thread to open thread:

• From N unresolved threads to N open threads
• From Unresolve thread to Re-open thread
• From Jump to next unresolved thread to Jump to next open thread