refactor: decouple default search UI interface logic from backend

[Junjiequan]

Description

This PR aims to separate frontend configuration from the backend, making the frontend more autonomous and reducing backend dependencies.

NOTE: Once its merged, tests need to be modified.

Motivation

To improve flexibility and maintainability while reducing unnecessary backend dependencies.

Changes:

• Replaced references to localColumns with defaultDatasetsListSettings.columns with backward compatibility .
• Added defaultDatasetsListSettings to AppConfig for default filters, columns, and conditions in the dataset list.
• Introduced labelMaps to store filter labels in AppConfig. If not provided, fallback to component.instance.label.
• Removed get default settings endpoint.

Tests included

• Included for each change/fix?
• Passing? (Merge will not be approved unless this is checked)

Documentation

• swagger documentation updated [required]
• official documentation updated [nice-to-have]

official documentation info

If you have updated the official documentation, please provide PR # and URL of the pages where the updates are included

Backend version

• Does it require a specific version of the backend
• which version of the backend is required:

[sonarqubecloud]

Quality Gate failed

Failed conditions
8.9% Duplication on New Code (required ≤ 3%)

See analysis details on SonarCloud