feat: add comment selector - #10850

This PR introduces the ability to select and edit a specific comment using a jq selector when using the --edit-last flag in issue comment and pr comment commands.

The previous behavior always edited the last comment by the current user. This change provides more flexibility, enabling users to programmatically pick the right comment based on content or metadata, which is particularly useful in automated or scripted environments.

• New flag: --edit-selector
  Allows users to specify a jq expression to select a specific comment (instead of defaulting to the latest one).
  Example usage:

  gh pr comment --edit-last --edit-selector '. | select(.body | contains("<!-- some arbitrary tag -->"))'
  gh pr comment --edit-last --edit-selector '. | select(.id == "2823981412")'

• Updated logic in CommentableOptions and updateComment():

  • When --edit-selector is used, the code attempts to evaluate the selector against the list of comments.
  • If a match is found, that comment is edited.
  • If no match is found, an error is returned.

• Dependency update:

  • Moved github.com/itchyny/gojq v0.12.15 from indirect to direct dependency in go.mod.

• Tests:

  • Added unit tests for selectComment() covering selector matches and failures.