Shade test jars from compiler used in Gradle tests

This fixes `VerifyError` for all integration tests calling
`KotlinTestUtils.findAndroidSdk()`.
The exception was thrown because `:kotlin-gradle-plugin-integration-tests`
was depending on both relocated intellij-core (from kotlin-compiler-embeddable)
and non-relocated intellij-core (transitevely through tests jars from compiler).

A call to `findAndroidSdk()` was triggering classloading
for `KotlinTestUtils` which had bytecode references to
`org.jetbrains.kotlin.idea.KotlinLanguage` loaded from the embeddable compiler
and to `com.intellij.lang.Language` loaded from non-relocated intellij-core.

`KotlinLanguage` from the embeddable compiler was a subclass of relocated
`org.jetbrains.kotlin.com.intellij.lang.Language` thus it was not
assignable to `com.intellij.lang.Language` causing `VerifyError`.

The solution is to create relocated jar combining the necessary test jars
from the compiler.

settings.gradle

@@ -129,6 +129,7 @@ include ":kotlin-build-common",
         ":tools:kotlin-stdlib-gen",
         ":kotlin-gradle-plugin-api",
         ":kotlin-gradle-plugin",
+        ":kotlin-gradle-plugin-test-utils-embeddable",
         ":kotlin-gradle-plugin-integration-tests",
         ":kotlin-allopen",
         ":kotlin-noarg",
@@ -209,6 +210,7 @@ project(':tools:kotlin-stdlib-js-merger').projectDir = "$rootDir/libraries/tools
 project(':tools:kotlin-stdlib-gen').projectDir = "$rootDir/libraries/tools/kotlin-stdlib-gen" as File
 project(':kotlin-gradle-plugin-api').projectDir = "$rootDir/libraries/tools/kotlin-gradle-plugin-api" as File
 project(':kotlin-gradle-plugin').projectDir = "$rootDir/libraries/tools/kotlin-gradle-plugin" as File
+project(':kotlin-gradle-plugin-test-utils-embeddable').projectDir = "$rootDir/libraries/tools/kotlin-gradle-plugin-test-utils-embeddable" as File
 project(':kotlin-gradle-plugin-integration-tests').projectDir = "$rootDir/libraries/tools/kotlin-gradle-plugin-integration-tests" as File
 project(':kotlin-allopen').projectDir = "$rootDir/libraries/tools/kotlin-allopen" as File
 project(':kotlin-noarg').projectDir = "$rootDir/libraries/tools/kotlin-noarg" as File