Bug description:

rbac-backend plugin fails to load conditional yaml with extra delimiter. For example

```
—
result: CONDITIONAL
roleEntityRef: 'role:default/test-2'
pluginId: catalog
resourceType: catalog-entity
permissionMapping:
  - update
conditions:
  rule: IS_ENTITY_OWNER
  resourceType: catalog-entity
  params:
    claims:
      - 'group:default/team-a'
—
result: CONDITIONAL
roleEntityRef: 'role:default/test-3'
pluginId: catalog
resourceType: catalog-entity
permissionMapping:
  - read
  - delete
conditions:
  rule: IS_ENTITY_OWNER
  resourceType: catalog-entity
  params:
    claims:
      - 'group:default/team-a'
      - 'group:default/team-b'
—
```