Describe the feature or problem you’d like to solve

I would like to be able to call gh repo edit ... to set these flags on the repository:

• Allow squash merging (--enable-squash-merge):
  • squash_merge_commit_title=PR_TITLE|COMMIT_OR_PR_TITLE
  • squash_merge_commit_message=PR_BODY|COMMIT_MESSAGES|BLANK
• Allow merge commits (--enable-merge-commit):
  • merge_commit_title=PR_TITLE|MERGE_MESSAGE
  • merge_commit_message=PR_BODY|PR_TITLE|BLANK

Note: ignore use_squash_pr_title_as_default as it's deprecated.

Proposed solution

Modify https://github.com/cli/cli/blob/trunk/pkg/cmd/repo/edit/edit.go

Augment gh repo edit --enable-squash-merge option to allow for values other than =false, e.g. --enable-squash-merge=pr-title-and-body. Same for --enable-merge-commit.

or

Create 4 new separate options to mirror the Repository REST API.

Additional context

Issue is about setting these dropdowns from CLI:

For SEO the values of the dropdown are:

• Default message
• Default to pull request title
• Default to pull request title and commit details
• Default to pull request title and description