CI should have a step to generate API types for typescript and compare with the committed file for differences

[antoinemzs]

Context

Use case

Regenerating the API types file may be forgotten in some situations, leading to a potential discrepancy between the typescript proxies and the Java spec.

The CI should act as an early canary that running yarn generate-aip-types-from-api was potentially not run before committing changes by running it itself and checking if there are differnces with the commited file.

Current Workaround

No real workaround; discrepancies may be discovered by accident in other branches.

Proposed Solution

CI step:

• run the yarn job
• check if there are changes compared to the commited file:
  • yes: fail run
  • no: continue