fix(url): handle arbitrary number of levels for relative paths

[DavidVogel]

This pull request enhances the sanitizeUrl utility function to handle URLs with multiple levels of relative paths (such as ../../file.json), ensuring correct path reconstruction. Unit tests have also been added to verify this new behavior.

Description

Improvements to URL sanitization:

• Updated sanitizeUrl in src/core/utils/url.js to correctly process and reconstruct URLs with multiple ../ segments, supporting cases like ../../file.json and deeper relative paths.

Motivation and Context

Current method only handles up to 1 parent level. This allows an arbitrary number of levels.

Fixes #4107

How Has This Been Tested?

• Added new test cases in test/unit/core/utils.js to verify that sanitizeUrl correctly handles URLs with two or more ../ segments.

Screenshots (if appropriate):

Checklist

My PR contains...

• No code changes (src/ is unmodified: changes to documentation, CI, metadata, etc.)
• Dependency changes (any modification to dependencies in package.json)
• Bug fixes (non-breaking change which fixes an issue)
• Improvements (misc. changes to existing features)
• Features (non-breaking change which adds functionality)

My changes...

• are breaking changes to a public API (config options, System API, major UI change, etc).
• are breaking changes to a private API (Redux, component props, utility functions, etc.).
• are breaking changes to a developer API (npm script behavior changes, new dev system dependencies, etc).
• are not breaking changes.

Documentation

• My changes do not require a change to the project documentation.
• My changes require a change to the project documentation.
• If yes to above: I have updated the documentation accordingly.

Automated tests

• My changes can not or do not need to be tested.
• My changes can and should be tested by unit and/or integration tests.
• If yes to above: I have added tests to cover my changes.
• If yes to above: I have taken care to cover edge cases in my tests.
• All new and existing tests passed.