Assigning issues is broken on Atlasssian Cloud due to name parameter deprecation

Referring to users by "name" is no longer allowed due to GDPR and seems to break assigning of issues using assign_issue() (Client 400 error). I believe we need to replace "name" with "accountId" per https://developer.atlassian.com/cloud/jira/platform/deprecation-notice-user-privacy-api-migration-guide/