feat: rbac middleware

[zlwaterfield]

This reverts commit b49e024.

Re-reverting the RBAC PR with a few changes to resolve the issue that caused the revert.

This PR makes one extra change to solve the reason for the revert, see commit here.

More context in Slack

• https://posthog.slack.com/archives/C0113360FFV/p1732553537147669
• https://posthog.slack.com/archives/C07Q2U4BH4L/p1732631051026149
• https://posthog.slack.com/archives/C07Q2U4BH4L/p1732229071630309

[sentry-io]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ OperationalError: consuming input failed: query_wait_timeout /api/feature_flag/local_evaluation/ View Issue
• ‼️ ValidationError: '“%(value)s” is not a valid UUID.' /.* View Issue
• ‼️ AttributeError: 'NoneType' object has no attribute 'id' /api/organizations/{parent_lookup_organization_... View Issue
• ‼️ OperationalError: consuming input failed: query_wait_timeout /api/feature_flag/local_evaluation/ View Issue
• ‼️ OperationalError: consuming input failed: query_wait_timeout /api/feature_flag/local_evaluation/ View Issue

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