[Build] Add runtime dependency on descriptors.runtime to tests for low level api

This is needed to keep ability to run those tests using JPS

analysis/low-level-api-fir/build.gradle.kts

@@ -41,6 +41,8 @@ dependencies {
     testApi(project(":kotlin-reflect"))
     testImplementation(project(":analysis:symbol-light-classes"))
 
+    testRuntimeOnly(project(":core:descriptors.runtime"))
+
     testApi(intellijDep()) {
         includeJars(
             "jps-model",