Highlight schema validation issues in editor #589
Description
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Issue details
When writing an ESC environment in YAML, it would be useful to highlight where keys are incorrect. The most basic version could just be based on a JSON schema (see also #251 and #145).
For example, if environmentVariables is specified as a top-level key rather than nested under values, then it should be clear this is wrong. Similarly, functions such as fn::secret should have clear errors if trying to specify an invalid input property.