Fix type generation when tsconfig's "incremental" option is true

[astegmaier]

↪️ Pull Request

This fixes #7351

The issue is that @parcel/transformer-typescript-types will output blank .d.ts files when the user supplies a tsconfig.json with "incremental": true. The solution is to override this to ensure that we always set it to false before trying to generate types.

It's a follow up to #5346 and tweaks the unit test from that PR to cover both the original case, and this one.

💻 Examples

Examples are in the original bug (#7351).

✔️ PR Todo

• Added/updated unit tests for this change
• Included links to related issues/PRs

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