Remove unnecessary Role and RoleRBAC permission from existing demos

[Jeffwan]

🚀 Feature Description and Motivation

https://github.com/aibrix/aibrix/blob/daf89f4af6f7b51f1ab3814a1dba999303801a65/docs/development/app/deployment.yaml#L75-L118

this should be removed. If any pod need pod/deployment list permissions, we should create them along with that component instead of manipulating the default service account

Use Case

No response

Proposed Solution

No response

[Jeffwan]

It has been addressed in #143 and we can close it now.