[7.9] [Security solution] Threat hunting test coverage improvements (#73276)

[stephmilovic]

Backports the following commits to 7.9:

• [Security solution] Threat hunting test coverage improvements ([Security solution] Threat hunting test coverage improvements #73276)

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: 0a757f9

Build metrics

✅ unchanged

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