[FIR JS] KT-57601: Get rid of the builtin provider

In this example we get 2 variants of `kotlin/toString()`:
one coming from the KLib provider, and the
other coming from the builtins provider.
These are identical deserialized functions.

^KT-57601 Fixed

compiler/incremental-compilation-impl/build.gradle.kts

@@ -43,10 +43,12 @@ sourceSets {
 projectTest(parallel = true) {
     workingDir = rootDir
     dependsOn(":kotlin-stdlib-js-ir:packFullRuntimeKLib")
+    useJsIrBoxTests(version = version, buildDir = "$buildDir/")
 }
 
 projectTest("testJvmICWithJdk11", parallel = true) {
     workingDir = rootDir
+    useJsIrBoxTests(version = version, buildDir = "$buildDir/")
     filter {
         includeTestsMatching("org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunnerTestGenerated*")
     }