Swap out call to CommitsByMessage to ListCommits

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gitaly#4749 (closed) details slow performance of searching commits by message if the repository is very large and has a deep history of commits. Instead of using the CommitsByMessage RPC, we can use the more efficient ListCommits RPC which has an option for searching commits after a certain date.

Create an option after in the call that gets passed to list_commits that can be called through the UI/API.

As an immediate workaround to improve commit query performance for large repositories:

• RPC will be swapped by a hardcoded after option value when a feature flag is enabled.
• The hardcoded value will be set to 3 months.
• The feature flag will be enabled in self-managed GitLab instances as a workaround to improve performance until user specified time values are supported.