The purpose of this task is to fix missing icons in the code snippet preview for EuiEmptyPrompt. Code snippets are serialized and passed to the Demo component. Icons are displayed as their names in form of a string.

Relevant files:
packages/website/docs/components/display/empty_prompt/guidelines.mdx
packages/website/docs/components/display/empty_prompt/types_of_empty_states/index.ts