Add test values for GCP, Meta, and Segment

Changes are mostly self-explanatory—or at least they're intended to be!

Adds tests for:

• gitlab-org/security-products/analyzers/secrets!189 (merged)
• gitlab-org/security-products/analyzers/secrets!190 (merged)
• gitlab-org/security-products/analyzers/secrets!191 (merged)
• gitlab-org/security-products/analyzers/secrets!192 (merged)