Updating SAT, removing modules, removing explicit dependencies, etc.

[JDBraun]

• [AWS] SAT update based on new release #93: SAT has been updated, it no longer requires a PAT token, and has been tested in the sandbox environment to be working.
• [AWS] Workflow system tables is now Lakeflow #92: Workflow has been updated to [Lakeflow](https://github.com/JDBraun/terraform-databricks-sra/blob/9d15a350bb386eb8cd440f418e29d628b2301d3f/aws/tf/modules/sra/databricks_workspace/workspace_security_modules/system_schema/system_schema.tf).
• [AWS] Remove explicit depends on workspace for certain resources and modules #91: Removed explicit dependencies on PrivateLink resource, this should make it so if the workspace needs to update the PrivateLink endpoints will not need to be recreated. I attempted to remove the Unity Catalog dependencies, but faced errors on user permissions, so this stays the same.
• [AWS] System tables are now GA #90: System tables have been moved to under workspace security modules and have been removed from the seperate 'public preview' folder.
• [AWS] Only create admin SP if SAT is being used #89: The example admin service principle has been removed, the principle that is doing the deployment will also handle SAT
• [AWS] Remove PAT token and secrets modules #88: PAT token and secret modules have been deleted
• I've updated the Unity Catalog init resource where that now pulls the data source, instead of the assignment. Tested and worked both within existing metastore and new metastore

[JDBraun]

@airizarryDB for gov-cloud review
@db-wenxin for general review

[JDBraun]

this new commit should address @sastafford issue: #97 and #98

[airizarryDB]

aws-gov looks good