scout: update cli to 1.18.4 (#23485)

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## Description

Updated scout cli to 1.18.4
- Got vendor'd content from upstream
- Created new placeholders in `content/reference/cli/docker/scout` for
new commands
- Updated release notes


https://deploy-preview-23485--docsdocker.netlify.app/reference/cli/docker/scout/

https://deploy-preview-23485--docsdocker.netlify.app/scout/release-notes/cli/

## Related issues or tickets

DHI-449

## Reviews

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- [ ] Editorial review

Signed-off-by: Craig <[email protected]>

Author: craig-osterhout