Implement Service Provider Flux

[maximiliantech]

Understand the Task

Description
Implement a new service provider for Flux, based on the MCP Architecture V2.
The Service Provider Flux should be able to install/update/delete Flux instances on Managed Control Planes.

https://github.com/openmcp-project/service-provider-flux

To accomplish this, we will use the carve-out-approach in the first round, see #199

What is required to accept the Task as done.

Implementation

• The service-provider-flux manages a new "Flux" instance resource
• Uses the Juggler approach for handling Flux installation, see https://github.com/openmcp-project/control-plane-operator/blob/main/pkg/controlplane/components/flux_component.go
• Initialize Pipeline
• prepare open source
• Write tests

Done Criteria

• Finish implementation
• Code has been reviewed by other team members
• Internal technical Documentation created/updated
• New / changed code is documented
• Unit Tests created for new code or existing Unit Tests updated
• Integration Test Suite updated
• Enduser Documentation updated (if applicable)
• Successful demonstration in Review