This commit is primarily focused on fixing the existing `gh issue create` tests with the changes to the underlying queries retrieving the data for resolving metadata.
Additionally, a new test case for `gh issue create --web --assignee @copilot` was added to mirror existing tests. While exercising this capability, I found out the web UI apparently wants `copilot` instead of the `copilot-swe-agent` login, so changes to address that were a part of this commit.
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