fix missing returns from converting functions from lambdas

[TheJolman]

No description provided.

[Copilot]

Pull Request Overview

This PR fixes missing return statements in functions that fetch or retrieve resources by converting lambda-style calls into functions that properly return values.

• Adds return statements to fetch_* functions so that they now propagate the result from fetch_res.
• Adds return statements to retrieve_saved_* functions to return values from retrieve_saved.

Comments suppressed due to low confidence (2)

oss_stats/stats.py:136

• The change now returns the fetched resource in fetch_commits. Verify that all callers of fetch_commits are updated to handle the new return value.

    return fetch_res(COMMITS_KEY)

oss_stats/stats.py:169

• Adding a return statement in retrieve_saved_commits changes its API behavior. Please confirm that any usage of retrieve_saved_commits is updated to make use of the returned data.

    return retrieve_saved(COMMITS_KEY)