Refactor tree retrieval to use a non deprecated method

[ludeeus]

The entire repository_object is deprecated in aiogithubapi; this is a small step in getting rid of it.

LegacyTreeFile has been added as a compatibility layer, as significant refactoring is needed to eliminate outdated assumptions.

[Copilot]

Pull Request Overview

This PR refactors the repository tree fetching mechanism to use a direct API call instead of the legacy repository object method, introducing a LegacyTreeFile compatibility layer to maintain the expected tree structure interface.

• Introduces LegacyTreeFile class as a compatibility wrapper around GitHubGitTreeEntryModel
• Refactors get_tree() to directly call the GitHub API instead of using repository_object.get_tree()
• Updates exception handling from AIOGitHubAPIException to GitHubException

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
custom_components/hacs/utils/workarounds.py	Adds LegacyTreeFile class to wrap GitHub tree entry models with backward-compatible attributes
custom_components/hacs/repositories/base.py	Refactors get_tree() method to use direct API call and wraps results in LegacyTreeFile objects

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