Remove simple_content_access field from Organization entity

[zjhuntin]

The simple_content_access field was removed from Katello's Organization API response in Katello PR #11616 as SCA is now the only content access mode. This field is no longer returned by the API, causing KeyError when reading Organization entities.

Description of changes

Remove simple_content_access from the organization entity as it was removed in Katello.

Upstream API documentation, plugin, or feature links

Katello/katello#11616

[sourcery-ai]

Hey - I've left some high level feedback:

• Consider whether this removal needs any compatibility handling for environments still talking to older Katello versions that may still return simple_content_access, and if so, gate the field definition or parsing accordingly.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Consider whether this removal needs any compatibility handling for environments still talking to older Katello versions that may still return `simple_content_access`, and if so, gate the field definition or parsing accordingly.

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