Allow variable references in non-string fields in the JSON schema

[shreyas-goenka]

Tests

Verified manually.

Before:

After:

Manually verified the schema diff is sane. Example:

< "type": "boolean",
< "description": "If inference tables are enabled or not. NOTE: If you have already disabled payload logging once, you cannot enable again."
---
> "description": "If inference tables are enabled or not. NOTE: If you have already disabled payload logging once, you cannot enable again.",
> "anyOf": [
> {
> "type": "boolean"
> },
> {
> "type": "string",
> "pattern": "\\$\\{([a-zA-Z]+([-_]?[a-zA-Z0-9]+)*(\\.[a-zA-Z]+([-_]?[a-zA-Z0-9]+)*)*)\\}"
> }
> ]

[shreyas-goenka]

The current approach is not ideal from a top down POV, and there is indeed room for refactoring out the "Go struct" -> "JSON Schema" transformation from bundle-specific transformations. That being said, I think this approach is fine given we don't anticipate a lot of changes to bundle schema generation, and it'll not be that hard to refactor if we need to in the future.

[pietern]

The asserts on the JSON serialized format are not ideal but can be addressed another time.