Describe the bug

When I ran gh pr create --fill I had one commit on the branch with a msg like this:

Testing one, two, three

More details and some paragraphs here.

It looks like the CLI created the PR title with everything up to the first comma:

Testing one

Then the body/description for the PR included the rest of the first line in the body:

two, threeMore details and some paragraphs here.

So it was split after the first comma.

gh version 2.44.1 (2024-02-16)
https://github.com/cli/cli/releases/tag/v2.44.1

This might relate somewhat to this issue although I'm not sure:
#8706

Steps to reproduce the behavior

Create a branch with a single commit that has comma in the first line of the commit message. Then:

gh pr create --fill

Expected vs actual behavior

I would expect the whole first line of the commit message to be used as the subject for the PR. Not just the text up until the first comma.