chore: add new managed service providers

[utkuerol]

We have 3 new providers (rabbitmq, valkey, opensearch) in PoC state which we would like to be able to early QA towards a preview state. This PR adds the new providers to config.managedServices and the new required components to config.managedServiceBackends.

[Copilot]

Pull request overview

Adds PoC managed service providers (rabbitmq, valkey, opensearch) to the installer’s default codesphere.managedServices list and extends the config schema / resource-profile handling to include additional managed-service backend components.

Changes:

• Extend default Codesphere.ManagedServices to include opensearch, rabbitmq, and valkey (all v0).
• Extend ManagedServiceBackendsConfig schema with k8sBackend and rabbitMqOperator entries (plus new config types).
• Update the noRequests resource profile to initialize/apply overrides for the new k8sBackend backend and to initialize the RabbitMQ operator backend config; update tests accordingly.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
internal/installer/resource_profiles.go	Initializes new managed-service backend configs under the noRequests resource profile and applies zero-request resource overrides for k8sBackend.
internal/installer/resource_profiles_test.go	Adds assertions for the new managed-service backend fields under the noRequests profile.
internal/installer/files/config_yaml.go	Extends the YAML config schema for managedServiceBackends to include k8sBackend and rabbitMqOperator.
internal/installer/config_manager_profile.go	Adds opensearch, rabbitmq, and valkey to the default managed services list.
internal/installer/config_manager_profile_test.go	Updates managed-services expectations to include the new providers and new total count.

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