Remove the deprecated slug prop from components

[ariellalgilmore]

Following: #17921

The slug prop was deprecated in multiple components in favor for the decorator prop

• remove slug prop and references in code
• update styles so only decorator styles are needed and specific styles targettingai-label classes
• remove unnessary tests covering slug prop
• update storybook: no longer need to hide slug in table
• verify decorator styles still work
• ideally there should be no references to the word slug anywhere in code now