Ability to change Pull Request status to "In Review"

[tim-fiola]

The pull request review screen should be able to change the PR status to "In Review".

This status does exist: the PR is automatically placed in "In Review" if the first pull request review is of the "Comment" type.

This would be useful in a CI setting:

• Once a PR is created the CI setting runs tests on the data
• If the tests fail, the PR could be placed in "Blocked" status by the CI tool
• If a user fixes the data errors that caused the failure, there should be a way to get the PR out of "Blocked" status
  • Currently the only way to get the PR out of "Blocked" status is to set it to "Approved" in a PR review
• Setting the PR back to "In Review" could be used to show that the fix attempt has been made

This status does exist already:

This status should be available when a user adds a PR review: