chore!: remove legacy `patch` `pods` fallback

[agilgur5]

Motivation

• the fallback is old and insecure, and the error confuses users as it's not mentioned in the docs (as it's legacy and a fallback)
  • e.g. #12783 and also frequently on Slack
• it's also tech debt that we have to write code around specifically right now
• it's no longer needed and hasn't been the main RBAC in a few versions, so remove it in the next breaking minor release

Modifications

• remove the Executor code that patches pods
• remove the operator code that reads the patched annotations

Verification

Tests pass

[agilgur5]

@Garett-MacGowan would you be interested in taking over this PR? This seems to need more refactoring than I anticipated (given the failing tests) and I know you've worked with some of these pod annotations before

[Garett-MacGowan]

Hey! Sorry for the late response, I've been swamped. I can try and take a look at this some time next week.