DOCS-8081: Add Cloud Security Management videos

[drichards-87]

What does this PR do? What is the motivation?

Adds Cloud Security Management videos. See DOCS-8081 for details.

Merge instructions

• [ ] Please merge after reviewing

Additional notes

[github-actions[bot]]

Preview links (active after the build_preview check completes)

New or renamed files

• https://docs-staging.datadoghq.com/deforest/docs-8081-csm-updated-videos/security/cloud_security_management/video_tutorials

Modified Files

• https://docs-staging.datadoghq.com/deforest/docs-8081-csm-updated-videos/security/cloud_security_management/identity_risks/
• https://docs-staging.datadoghq.com/deforest/docs-8081-csm-updated-videos/security/cloud_security_management/vulnerabilities/