bitbucketserver: clean up plugin configuration
Created by: kzh
This PR cleans up the Bitbucket Server plugin configurations. It moves all the feature options (alternative roaring bitmap permissions endpoint and automation webhooks) to the bitbucket server external service configuration on a per instance basis.
"plugin": {
"webhooks": {
"secret": "secret",
},
"permissions": "enabled"
}
The docs and changelog need to be updated.