Migrate ts-codegen to @hey-api/openapi-ts

[celdrake]

The openapi-typescript-codegen is now deprecated, the recommended alternative is @hey-api/openapi-ts
I saw this when I was reviewing options for adding schema suggestions etc to the YAML editor. Seems like the "schema.gen.ts" that can be generated could be useful for this.

There are some differences in how the types are generated:

1. Now the types are all created in a single file, types.gen.ts, which is later renamed as index.ts
2. ConditionType is now being generated correctly
3. DeviceSystemInfo is generated with incorrect "additionalProperties" of type CustomInfo. I added a transformer that modifies the schema so it's generated correctly (as before).
4. RolloutDeviceSelection is generated incorrectly, it should be a pure alias to BatchSequence (as before). I added a transformer for this too.
5. There is a warning related to ESlint now when running "npm run lint", but it all seems to work fine.

[coderabbitai]

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[celdrake]

By default, enums would be created as types which would break a lot of our code.
Also, by default it uses the SCREAMING_SNAKE_CASE casing which would have required a lot more changes.

With the previous generator, only some types were using SCREAMING_SNAKE_CASE (eg. Event.type, etc)

[celdrake]

@coderabbitai The gist of this PR was to change the code generator for the Typescript types definitions.
The old generator produced one file per type, under /libs/types/models.
The new generator produces a single file for all types, which we rename to "index.ts"

There's no need to review the changes of the files removed at libs/types/models folder.

[coderabbitai]

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@celdrake: Thank you for the clarification! I understand now - this PR migrates from openapi-typescript-codegen (which generated one file per type in /libs/types/models) to @hey-api/openapi-ts (which generates a single index.ts file with all types). I'll focus the review on:

1. The new generator configuration and setup
2. The transformers you added for DeviceSystemInfo and RolloutDeviceSelection
3. The newly generated types in the single index.ts file
4. Any integration changes needed due to the migration

I'll skip reviewing the deleted files in the /libs/types/models folder as those are simply being replaced by the new generation approach.

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✏️ Learnings added

Learnt from: celdrake
URL: https://github.com/flightctl/flightctl-ui/pull/367

Timestamp: 2025-10-10T11:35:04.447Z
Learning: In the flightctl-ui repository, TypeScript types are generated using hey-api/openapi-ts and output to a single index.ts file (previously used openapi-typescript-codegen with one file per type under /libs/types/models).

Note: Learnings are effective only in the context of similar code segments. To apply general coding guidelines, please configure review instructions. You can manage existing learnings in the app.

[celdrake]

We'll review in the future if this is needed. Closing for now.