When we enable `webpackBuildWorker` this module level `const apiRouteWarnings = new LRUCache({ max: 250 })` will be created in 3 workers, so users will see 4 outputs (last one is static optimization):

<img width="740" alt="CleanShot 2023-04-29 at 20 20 38@2x" src="https://user-images.githubusercontent.com/3676859/235318861-2ec12e30-70b2-4b56-8a2e-df08d130c349.png">

This PR fixes that and now there's only 1.

Follow-up to #48959, adds the right types after the renames of
properties.

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These were added early on based on some assumptions around how the
params would be passed. In the actual implementation it works
differently so these are just dead code.

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Related change: #49003. This PR makes sure that these related IntelliSense features are updated:

### Invalid

<img width="842" alt="CleanShot 2023-04-30 at 19 33 06@2x" src="https://user-images.githubusercontent.com/3676859/235367543-3c64ebb9-47fd-48d9-a846-60ec39bf0d3b.png">

### Region (`string`)

<img width="822" alt="CleanShot 2023-04-30 at 19 33 29@2x" src="https://user-images.githubusercontent.com/3676859/235367567-249041cb-9f2b-4693-815d-347ff200244f.png">

### Regions (`string[]`)

<img width="487" alt="CleanShot 2023-04-30 at 19 34 20@2x" src="https://user-images.githubusercontent.com/3676859/235367609-503294d1-ec9b-4d04-9aa7-4e76636eca60.png">

### Docs

<img width="679" alt="CleanShot 2023-04-30 at 19 34 41@2x" src="https://user-images.githubusercontent.com/3676859/235367630-74be18ed-ffc7-4b2d-ae3f-0ad6a187b166.png">

Closes #48807.

The issue seems to be introduced with recent React Float change, which isn't a real problem but a behavior change. Resources are layered by the `precedence` key and the style insertion logic can be simplified as "insert the new stylesheet right after the existing stylesheet in the same layer". When multiple stylesheets are inserted in the same render pass, their new order will be flipped.

This is a nice feature so we can always maintain the order of resources that might conflict.