Replace dependencies on kotlin-reflect with kotlin-reflect-api

See the previous commit for information on the kotlin-reflect vs
kotlin-reflect-api distinction.

Add kotlin-reflect as an explicit runtime dependency of most of the test
configurations because even though they all depend on tests-common, the
runtime dependency on kotlin-reflect is not exported from tests-common
to other modules because the projectTests dependency is not transitive.

compiler/tests-java8/build.gradle.kts

@@ -5,6 +5,7 @@ apply { plugin("kotlin") }
 dependencies {
     testCompile(projectTests(":compiler:tests-common"))
     testCompile(projectTests(":generators:test-generator"))
+    testRuntime(projectDist(":kotlin-reflect"))
 }
 
 sourceSets {