27605 Add research proposal to issue templates

.gitlab/issue_templates/Research Proposal.md

+### Background:
+
+(Include problem, use cases, benefits, and/or goals)
+
+**What questions are you trying to answer?**
+
+**Are you looking to verify an existing hypothesis or uncover new issues you should be exploring?**
+
+**What is the backstory of this project and how does it impact the approach?**
+
+**What do you already know about the areas you are exploring?**
+
+**What does success look like at the end of the project?**
+
+### Links / references:
+
+/label ~"UX research"