feat: added pr template

[Mikelle]

Added PR template. Benefits of having it:

• Consistency: all PRs follows the same format, making them easier to review
• Efficiency: guides contributors what to include, speeding up the PR creation
• Thoroughness: Prompts for essential details like changes, testing, and impact, ensuring nothing is missed
• Transparency: Encourages clear communication of changes, improving team transparency

[shaspitz]

I'm good with this checklist if it's helpful to people and stays simple 👍 I just have a personal gripe with PR checklists because it got unnecessarily large at my last job and clearly slowed down the team.

My opinion is that the first point is implicit to any PR, and the rest should preferably be automated via ci (I believe we're close to automating the last point with infrastructure / Setup and Test Nomad Cluster? As that would save significant time for small changes)

[Mikelle]

Thank you for your feedback! Sure, we can delete the first point if you think it’s redundant. I think we could remove the others once this will be automated. If any of the checkpoints are not required for the PR, they can simply be deleted.