Update `suggest_edits` prompt to clarify usage of `<old_text>` when using update/create operations using update/create operations. - Add a mention that `old_text` is required for all but create. - Change definition of `create` operation to also mean overwrite, as some models heavily prefer rewrites. - Remove mention of `If this tag is not specified, then the entire file will be used as the range.` which is not current behavior. Closes #22340 Release Notes: - N/A (not sure if this requires a release note)