Fix codegen-openapi tests

[aryaemami59]

Overview

Previously the codegen tests would create side effects which made them unpredictable and caused them to produce inconsistent results. This PR mainly focuses on making the unit tests reliable both during local development and CI.

This PR:

• [X] Replaces the old cli command in cli.test.ts with a promisified version of Node's exec which mimicks the actual cli behavior more closely.
• [X] Enables importHelpers for a slightly smaller bundle size.
• [X] Revamps the tsconfig setup to have a tsconfig.build.json and tsconfig.json as opposed to a test/tsconfig.json with baseUrl.
• [X] Uses path aliasing to test against the output lib folder during CI. vite-tsconfig-paths was added to devDependencies to manage this easier.
• [X] Disables fileParallelism for unit tests in order to minimize side effects.
• [X] Creates a more comprehensive CI workflow for the codegen-openapi that tests against the final build artifact on different operating systems.

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[markerikson]

@aryaemami59 fyi the "ts/json/etc should be the same" test seems to be flaky - sometimes it can't find example.ts. Some kind of filesystem race condition, maybe?

[aryaemami59]

Yup that's exactly what it is. I'll have to look into it later.