feat(typescript-estree): remove false from optional AST boolean properties

[JoshuaKGoldberg]

PR Checklist

• Addresses an existing open issue: fixes AST standardisation: remove undefined/optional from node properties unless it really makes sense #5020
• That issue was marked as accepting prs
• Steps in CONTRIBUTING.md were taken

Overview

Switches most ?: boolean and : boolean properties to ?: true in ast-spec. Updates convert.ts accordingly to only assign those properties if they're true.

Does not update snapshots that need manual touchups, pending resolution of whether to use this or #6274.

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[typescript-eslint]

Thanks for the PR, @JoshuaKGoldberg!

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[JoshuaKGoldberg]

Going with #6274 per #5020 (comment).