Describe the feature or problem you’d like to solve

Currently running gh pr comment --edit-last will fail if there is not an existing comment from the author. It would be nice to prompt users and/or allow users to use the option (or a new option) that will edit the last comment if it it exists but creates a new one if not.

❯ gh pr comment 5 --edit-last --body 'This is just a test'
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Proposed solution

Add an additional option for gh pr comment such as --edit-last-or-create that will not fail if the user hasn't yet commented on the PR, it will simply create a new comment.

❯ gh pr comment 5 --edit-last-or-create --body 'This is just a test'
https://github.com/joe-sharp/<redacted>/pull/5#issuecomment-<redacted>

How will it benefit CLI and its users?
Script writers will no longer need to worry about making a conditional to check if a comment exists before running the command. This is useful for commenting the results of a build or linting job without polluting the PR with multiple comments.

Additional context

Please let me know if additional context is needed, but this should be pretty straight forward.