Migrate Module Manager to the declarative v2 library

[janmedrek]

Description With the new version of the declarative library, there is a possibility to easily handle Helm, Kustomize and raw manifests. In order to support all of these approaches a new version of the library should be included in the Module Manager.

The use of a new library will also allow us to drop some of the unnecessary logic in the Module Manager, the code should be adjusted.

Acceptance Criteria

• [x] Module Manager uses declarative v2 library
• [x] Remove Worker Pool implementation from MM
• [x] Ensure Default CR handling still works as expected
• [x] Ensure KCP/SKR Client Differentiation works as expected
• [x] Run Performance Tests

[jakobmoellerdev]

Perf Test Results: 10.000 Kymas 200.000 Manifests