[Schema Inaccuracy] most GHE and AE specs missing `last_used` property definition for `public-key-full` schema but list it as required

[milo-minderbinder]

The following spec files (and presumably their de-referenced forms) all define a public-key-full component schema and specify last_used as one of its required properties, but do not actually define the property under the schema definition's properties:

• descriptions-next/ghes-3.2/ghes-3.2.json
• descriptions-next/ghes-3.3/ghes-3.3.json
• descriptions-next/ghes-3.4/ghes-3.4.json
• descriptions-next/ghes-3.5/ghes-3.5.json
• descriptions-next/ghes-3.6/ghes-3.6.json
• descriptions-next/github.ae/github.ae.json
• descriptions/ghes-3.2/ghes-3.2.json
• descriptions/ghes-3.3/ghes-3.3.json
• descriptions/ghes-3.4/ghes-3.4.json
• descriptions/ghes-3.5/ghes-3.5.json
• descriptions/ghes-3.6/ghes-3.6.json
• descriptions/github.ae/github.ae.json

Expected

The last_used property on the public-key-full schema should be defined.

Reproduction Steps

See links above