Support indexing repository name

Relates to issue #112 (closed)

Changes

This change adds support for using a project's full path as its display name in the search index. Previously, the system only used an internal identifier as the repository name. Now it accepts a "ProjectFullPath" parameter (like "company/my-project") while falling back to the old identifier if no path is provided.

Next Steps:

GitLab Rails will need to be updated separately to send ProjectFullPath. The repository name should be the full project path (e.g., "gitlab-org/gitlab-test").

The actual filtering by repository name in search queries will be handled by the Zoekt search engine itself and the webserver component, not by this indexer.