This commit refactors how `gh issue create` and `gh pr create` retrieve information needed to resolve metadata to be more in line with the approach used in `gh issue edit` and `gh pr edit`.
Previously, both commands used `prshared.fillMetadata(...)` function to retrieve assignees, reviewers, labels, and teams outside of `api.RepoMetadata(..)`. Now, these commands will consistently use the same logic and data for resolving metadata.
a8053d19a9