Geo: Fix snippet verification by replicating the HEAD ref

What does this MR do?

Snippet repositories are replicated with the Geo "Self-service framework". There is a bug in which the HEAD ref is not replicated. Mostly this means that in that case, automatic verification fails.

This MR replicates the HEAD ref and fixes verification of snippet repositories.

Fixes #334586 (closed)

Does this MR meet the acceptance criteria?


Availability and Testing

Edited by Michael Kozono

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