simplify issue creation script

[darinpope]

There isn't a clean who-am-i with gh, but you can get it from the API. Added in the API call so all we have to pass in is the date.

Testing done

ran locally and verified the issue was created correctly with my GitHub id

Submitter checklist

• Make sure you are opening from a topic/feature/bugfix branch (right side) and not your main branch!
• Ensure that the pull request title represents the desired changelog entry
• Please describe what you did
• Link to relevant issues in GitHub or Jira
• Link to relevant pull requests, esp. upstream and downstream changes
• Ensure you have provided tests - that demonstrates feature works or fixes the issue

[basil]

Thanks!