This commit is removing the option to install Elasticsearch OSS
distribution for version >= 7.11.0.
This is due to Elasticsearch recent license change.
See https://www.elastic.co/blog/licensing-change for more details.
- Add notice to breaking changes and update documentation
- Fail the deployment if trying to install OSS >= 7.11.0
- Remove OSS tests for 7.x except the upgrade test from last OSS version
to default distribution