Chore: refactor module catalog sync

[Tomasz-Smelcerz-SAP]

Description

The module catalog sync logic in internal/remote package was extended to sync ModuleReleaseMeta objects in addition to already supported ModuleTemplates.
The change was introduced by mostly copy-pasting existing logic and changing the object types and function names.
The package requires refactoring now for two main reasons:

• Latest changes introduced a lot of code duplication
• Internal structure of the package can be improved

Reasons

• remove code duplication
• Improve readability of the sync logic
• Improve maintainability of the sync logic
• Increase unit test coverage

Acceptance Criteria

• Come up with a better object model for a "syncer". Current split is based on legacy code that was "mechanically" refactored by decoupling methods directly calling each other with intermediate interfaces. So the resulting structure is far from being optimal or even "good".
• Re-use the sync code: the sync logic for 'ModuleTemplate' and 'ModuleReleaseMeta' is almost identical
• Improve names of types and functions
• Increase unit test coverage

Feature Testing

No response

Testing approach

Unit tests

Attachments

No response