Spike - Automaticlly regenerate GitLab CI JSON schema

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This is a spike issue to explore the possibilities for auto-generating JSON schema in GitLab CI

Today we can only maintain a JSON schema manually however this is not scalable since we keep adding keywords and improved flexibility to our syntax, we need a way to automatically update the JSON schema whenever there is a change to our syntax.

Previous spikes - #299190 (comment 522299513)