Send repo name for zoekt indexing

What does this MR do and why?

This change adds the project's full path (like "group/subgroup/project-name") to the data that gets sent when indexing a code repository for search functionality. The indexer side is already supporting the indexing with gitlab-zoekt-indexer!796 (merged). Previously, only the project's numeric ID was included, but now both the ID and the human-readable full path are provided. The tests were also updated to verify that this new project path information is correctly included in the data payload.

References

#586981 (closed)

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