Suggestions end up in unsubmittable pending state

[MetRonnie]

• Extension version: v0.100.0
• VSCode Version: 1.95.3 (system setup)
• OS: Windows_NT x64 10.0.19045
• Repository Clone Configuration: fork of an upstream repository
• Github Product: Github.com

Steps to Reproduce:

1. Make multiple changes to different "hunks" in a file and click the "Create pull request suggestions" button in the Source Control panel

   Here my suggestions ended up as 4 pending comments:

   gh-pr-bug-3-p1.mp4

2. This can lead to multiple individual reviews being started on GitHub and only being able to submit a subset of the suggestions in the review

   On the GH website only 1 comment is in the review:

   gh-pr-bug-3-p2.mp4

   The other comments end up stuck as pending and cannot be submitted in a review

This is superficially similar to #4291, but in this case the comments clearly are making their way to the server in the pending state, but cannot be submitted.

#1317 may also be relevant