Capitalize page permission key conf

[Chaho12]

Description

Since both roles in web & security context are in upper-case, page permission should also be in upper case to match with roles.

Without this patch, user has to set upper-case key's in yaml in their yaml file as below, which is awkward as all other auth related confs are in lower-case.

pagePermissions:
  ADMIN:
  USER: dashboard_history
  API:

Additional context and related issues

Release notes

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* 

Test

pagePermissions:
  admin:
  user: dashboard_history
  api: