(MAINT) Fix rendering for YAML metadata

[michaeltlombardi]

PR Summary

Prior to this change, the metadata YAML blocks for schemas and CLI parameters included spaces in the keyword names, aligned colons, and used block syntax.

The platform does not render keywords correctly when they include spaces or when there is space between the keyword and the colon.

This change standardizes the formatting so that keywords are correctly highlighted. It also switches to using flow syntax for arrays, keeping them on one line if the array fits or breaking across indented lines otherwise.

PR Checklist

• [x] Descriptive Title: This PR's title is a synopsis of the changes it proposes.
• [x] Summary: This PR's summary describes the scope and intent of the change.
• [x] Contributor's Guide: I have read the contributors guide.
• [x] Style: This PR adheres to the style guide.

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