Use Scala Native test-interface-sbt-defs instead of test-interface

[zainab-ali]

See scala-native/scala-native#4844

Testing libraries and frameworks should depend on Scala Native's test-interface-sbt-defs, not test-interface.

• test-interface-sbt-defs defines a common interface for unit tests. It follows early-semver versioning.
• test-interface is a server implementation that must match the version of the Scala Native plugin. It follows strict versioning.

This was picked up by SBT 1.12.10, which added eviction checks for test dependencies.

How to reproduce

Create an SBT project with the following:

// project/build.properties
sbt.version = 1.12.11

// project/plugins.sbt
addSbtPlugin("org.scala-native" % "sbt-scala-native" % "0.5.11")

// build.sbt
scalaVersion := "3.3.7"
enablePlugins(ScalaNativePlugin)

ThisBuild / evictionWarningOptions := (ThisBuild / evictionWarningOptions).value
  .withConfigurations(List(Compile, Test))

libraryDependencies += "org.typelevel" %%% "weaver-cats" % "0.12.0" % Test

The sbt update command gives:

[error] (update) found version conflict(s) in library dependencies; some are suspected to be binary incompatible:
[error]
[error] 	* org.scala-native:test-interface_native0.5_3:0.5.11 (strict) is selected over 0.5.10 for test
[error] 	    +- default:scala-native-seed-project_native0.5_3:0.1.0-SNAPSHOT (depends on 0.5.11)
[error] 	    +- org.typelevel:weaver-framework_native0.5_3:0.12.0  (depends on 0.5.10)