Define HarborRegistry DTO types

## Motivation  

- Data coming from outside the source code must be represented as DTO types.
Otherwise, it becomes difficult to see at a glance which data is being used.

## Required Features

- Let's define the types using Pydantic related to Harbor and gather them in a single file for use.

## Impact  

- Since this is a refactoring task, there will be no impact.

## Testing Scenarios  

- None

JIRA Issue: BA-897