Add header to include repository URL in GitGuardian multiscan requests

GG Toolsrequested to merge
gg_tools/gitlab:gg_tools-master-patch-73312 into master
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What does this MR do and why?

This MR updates the git_guardian/client.rb logic to include a new header, GGshield-Repository-URL, when calling GitGuardian's API at https://api.gitguardian.com/v1/multiscan. This header provides the current repository URL, which is essential for enabling a new feature that allows clients to set repository-scoped filepath exclusion rules (e.g., ignoring all secrets found in .txt files within the foo repository).

Edited by GG Tools

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