[Projects] No Kotlin Multiplatform option on platform selection.

### Environment

SaaS (https://sentry.io/)

### Steps to Reproduce

Create a new project through the Sentry Web UI and search for "Kotlin" in the platform selection.

### Expected Result

You get two options
- Kotlin
- Kotlin Multiplatform

### Actual Result

Only Kotlin appears as an option, even though there are separate docs for Kotlin and Kotlin Multiplatform.

### Product Area

Projects - Project Creation

### Link

_No response_

### DSN

_No response_

### Version

_No response_