🤖 Refactor get_file_contents Method to Enforce Repo Name Requirement

[sentry-autofix]

👋 Hi there! This PR was automatically generated by Autofix 🤖

This fix was triggered by Jenn Mueng

Fixes SEER-7F

This update modifies the get_file_contents method in the autofix_context.py file. The previous implementation included a comment about duplicated functionality with the get_documents method in the CodebaseIndex class. The new implementation removes this comment and introduces a check to ensure that a repo_name is provided when calling get_file_contents. If repo_name is None, the method now raises a ValueError with a message indicating that a repo name is required because multiple repositories are present. This change ensures that the method operates correctly in environments with multiple repositories by enforcing the provision of a repository name.

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🤓 Stats for the nerds:

Run ID: 381
Prompt tokens: 43853
Completion tokens: 3275
Total tokens: 47128