Fix/deployable default

[peshence]

Description

Allow running polytope locally with a dummy datasource using the default values.

• remove global namespace enforcement since subcharts don't respect it anyway
• values changes:
  • add example auth-o-tron config
  • disable metrics on rabbitmq, mongodb
  • reduce default mongodb to 1 replica with medium resource preset
  • no longer persistent by default
  • add default imagePullPolicy: IfNotPresent (previously defaulted to Always via template)
  • disable ingresses by default
  • add default frontend nodeport to enable local development
  • default to polytope-staging (suggest overwriting)
  • default to using plain legacy auth
  • add default dummy datasource and collection

Contributor Declaration

By opening this pull request, I affirm the following:

• All authors agree to the Contributor License Agreement.
• The code follows the project's coding standards.
• I have performed self-review and added comments where needed.
• I have added or updated tests to verify that my changes are effective and functional.
• I have run all existing tests and confirmed they pass.