Upgrade deprecated /teams endpoint with /workspaces

[Daniel Barrett]

The “reviewers” text box in the “Create Pull Request” screen currently calls the deprecated /teams endpoint to get users, which currently fails.

Because this endpoint has been deprecated, and replaced by /workspaces https://developer.atlassian.com/cloud/bitbucket/bitbucket-api-teams-deprecation/ , we need to update this in the code.

I have a branch already with the fix ready to go

[Daniel Barrett]

My branch is https://bitbucket.org/atlassianlabs/atlascode/branch/fix/deprecated-team-endpoint

[Daniel Barrett]

I have raised a PR https://bitbucket.org/atlassianlabs/atlascode/pull-requests/1069