mr create only adds the last label when multiple labels are specified

Checklist

• I'm using the latest version of the extension (Run glab --version)
  • Extension version: glab version 1.30.0 (2023-05-19)
• Operating system and version: Mac OS 13.4 (22F66)
• Gitlab.com or self-managed instance? gitlab.com
• GitLab version (if self-managed) GitLab version here (Use the version endpoint, like this: gitlab.my-company.com/api/v4/version)
• I have performed glab auth status to check for authentication issues

Summary

mr create only adds the last label when multiple labels are specified

Steps to reproduce

glab mr create --fill --fill-commit-body --web -a me --label "category1::label1","category2::label2","category3::label3"

What is the current bug behavior?

MR is created, but issue description is the below, with no spaces in between labels. As a result, only the last is added

/label ~"category1::label1"~"category2::label2"~"category3::label3"
/assign me

What is the expected correct behavior?

A space is added between the labels to produce:

/label ~"category1::label1" ~"category2::label2" ~"category3::label3"
/assign me

Relevant logs and/or screenshots

Enumerating objects: 17, done.
Counting objects: 100% (17/17), done.
Delta compression using up to 8 threads
Compressing objects: 100% (8/8), done.
Writing objects: 100% (9/9), 699 bytes | 699.00 KiB/s, done.
Total 9 (delta 7), reused 0 (delta 0), pack-reused 0
remote: 
remote: To create a merge request for branchName, visit:
remote:   https://gitlab.com/org/area/repo/-/merge_requests/new?merge_request%5Bsource_branch%5D=branchName
remote: 
To gitlab.com:org/area/repo.git
   f8b329e9e41..15770d99917  HEAD -> branchName
Opening gitlab.com/org/area/repo/-/merge_requests/new in your browser.

Possible fixes

• Add space between labels