fix(bundle_analysis): Prevent AttributeError when pull.database_pull is None

[sentry]

This PR addresses an AttributeError: 'NoneType' object has no attribute 'get_comparedto_commit' occurring in bundle analysis notifications.

Root Cause:
When fetch_and_update_pull_request_information encounters a TorngitClientError (e.g., PR not found on the git provider) and the pull request is also not present in the database, it returns an EnrichedPull object where database_pull is None. The fetch_and_update_pull_request_information_from_commit function then passes this EnrichedPull object downstream. Later, ComparisonLoader.from_EnrichedPull attempts to access pull.database_pull.get_comparedto_commit() without a null check, leading to the AttributeError.

Solution:
Added a null check in fetch_and_update_pull_request_information_from_commit to explicitly return None if enriched_pull.database_pull is None. This ensures that functions calling fetch_and_update_pull_request_information_from_commit (like load_enriched_pull in notification contexts) receive None when a valid database pull cannot be established, allowing them to handle the scenario gracefully (e.g., by raising NotificationContextBuildError or falling back to alternative comparison methods).

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Fixes WORKER-P81

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[thomasrockhu-codecov]

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