[DOCS-122228] Replace summary with findings

[maycmlee]

What does this PR do? What is the motivation?

Merge instructions

Merge readiness:

• Ready for merge

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Additional notes

[github-actions]

Preview links (active after the build_preview check completes)

Modified Files

• https://docs-staging.datadoghq.com/may/replace-summary-with-findings/security/sensitive_data_scanner/
• https://docs-staging.datadoghq.com/may/replace-summary-with-findings/security/sensitive_data_scanner/guide/investigate_sensitive_data_issues
• https://docs-staging.datadoghq.com/may/replace-summary-with-findings/security/sensitive_data_scanner/setup/cloud_storage
• https://docs-staging.datadoghq.com/may/replace-summary-with-findings/security/sensitive_data_scanner/setup/telemetry_data