Add Pipeline Security group as code owners for secrets managers

Fabien Catteaurequested to merge
add-pipeline-security-codeowners into main

What does this MR do?

Adds gitlab-com/pipeline-security-group/backend as code owners for code related to integration with various secrets managers.

Why was this MR needed?

The Pipeline Security team maintains the secrets manager integrations in GitLab Runner and should be notified of changes to these components.

What are the relevant issue numbers?

N/A

Code owners coverage

This MR adds code ownership for the following directories:

  • helpers/vault/ - Vault/OpenBao integration
  • helpers/gcp_secret_manager/ - GCP Secret Manager integration
  • helpers/azure_key_vault/ - Azure Key Vault integration
  • helpers/aws/ - AWS Secrets Manager integration
  • helpers/gitlab_secrets_manager/ - GitLab Secrets Manager (OpenBao backend)
  • helpers/secrets/ - Secrets resolvers framework

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