Install Elastic Defend section cleanup (#591)

- Cleans up the Solutions and use cases > Security > Configure endpoint
protection with Elastic Defend > Install Elastic Defend section, and
consolidates serverless/stateful content.
- Removes serverless raw migrated files.

Previews:

- [Install Elastic
Defend](https://docs-v3-preview.elastic.dev/elastic/docs-content/pull/591/solutions/security/configure-elastic-defend/install-elastic-defend)
- [Enable access for macOS
Monterey](https://docs-v3-preview.elastic.dev/elastic/docs-content/pull/591/solutions/security/configure-elastic-defend/enable-access-for-macos-monterey)
- [Prevent Elastic Agent
uninstallation](https://docs-v3-preview.elastic.dev/elastic/docs-content/pull/591/solutions/security/configure-elastic-defend/prevent-elastic-agent-uninstallation)

Author: natasha-moore-elastic

raw-migrated-files/docs-content/serverless/security-agent-tamper-protection.md

@@ -188,7 +188,6 @@ toc:
       - file: docs-content/serverless/project-settings-content.md
       - file: docs-content/serverless/security-about-rules.md
       - file: docs-content/serverless/security-advanced-settings.md
-      - file: docs-content/serverless/security-agent-tamper-protection.md
       - file: docs-content/serverless/security-ai-assistant-esql-queries.md
       - file: docs-content/serverless/security-ai-assistant.md
       - file: docs-content/serverless/security-ai-for-security.md
@@ -235,8 +234,6 @@ toc:
       - file: docs-content/serverless/security-get-started-with-kspm.md
       - file: docs-content/serverless/security-host-isolation-exceptions.md
       - file: docs-content/serverless/security-ingest-data.md
-      - file: docs-content/serverless/security-install-edr.md
-      - file: docs-content/serverless/security-install-endpoint-manually.md
       - file: docs-content/serverless/security-interactive-investigation-guides.md
       - file: docs-content/serverless/security-isolate-host.md
       - file: docs-content/serverless/security-kspm.md