[PIM] GitHub: Adapt "Create new issues" to defined Issue Types

[anmittag]

What

Goal: Keep Process Description and GitHub Realization in sync.
New Issues are currently not matching with the process description and during the creation the type is not automatically set. This shall be improved.

How

https://github.com/eclipse-score/score/tree/main/.github/ISSUE_TEMPLATE

• Feature Request
• Program Increment
• Epic
• Bug
• Task

Estimates for realization

2h

Category

• Affects Detailed Design

Requirements / Architecture

• Requirements / Architecture are not affected by this change?