Configuring Bitbucket Cloud repositories in a plan branch fails

Issue Summary

When configuring a plan branch repository which is a Bitbucket Cloud repository, there is no option to select a different branch and the Repository field remains blank with a spinning wheel next to it.

Steps to Reproduce

1. Access a plan branch repository configuration
2. Select a Bitbucket Cloud repository, and enable the Change repository settings for this branch plan

Expected Results

You are able to make changes on branch plan repository and save them.

Actual Results

The drowdown menu to select a branch does not appear and the following exception is thrown on the browser console.

Workaround

There are two possible workarounds based on your authentication options linked to the Bitbucket Cloud repository.

If you use SSH to connect to your repository,

1. Access your plan branch repository configuration
2. Select the affected Bitbucket Cloud repository, and enable the Change repository settings for this branch plan
3. Scroll down to the page and click on Save repository
4. After doing so, the option to select a branch will be enabled at the top, and you'll be able to make changes to that repo, even after refreshing/navigating to another page.

For username/password authentication the workaround the steps are slightly different.

1. Access your plan branch repository configuration
2. Select the affected Bitbucket Cloud repository, and enable the Change repository settings for this branch plan
3. Scroll down to the page and click on Save repository
4. After doing so, the option to select a branch will be enabled at the top, and you'll be able to make changes to that repo, even after refreshing/navigating to another page.