ROX-24127: tenant resources via gitops

[ludydoo]

Description

Currently, only tweaking central CRs via gitops is possible.
I want to enable the VPA only for select tenants. But the VPA will be defined in the "tenant-resources" helm chart.

This PR adds the following features

• Defining the default tenant-resources chart values within the gitops config
• Overriding per-tenant tenant-resources chart values with gitops config
• "Graceful" fallback to previous implementation if the values are not provided via the gitops config

Checklist (Definition of Done)

• Unit and integration tests added
• Added test description under Test manual
• Documentation added if necessary (i.e. changes to dev setup, test execution, ...)
• CI and all relevant tests are passing
• Add the ticket number to the PR title if available, i.e. ROX-12345: ...
• Discussed security and business related topics privately. Will move any security and business related topics that arise to private communication channel.
• Add secret to app-interface Vault or Secrets Manager if necessary
• RDS changes were e2e tested manually
• Check AWS limits are reasonable for changes provisioning new resources
• (If applicable) Changes to the dp-terraform Helm values have been reflected in the addon on integration environment

Test manual

TODO: Add manual testing efforts

# To run tests locally run:
make db/teardown db/setup db/migrate
make ocm/setup
make verify lint binary test test/integration

[johannes94]

LGTM

[openshift-ci]

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This pull-request has been approved by: johannes94, ludydoo

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