AbstractScriptConfigurationTest: rewrite script template setup

Allow simpler setup of common scenarios
Do not require to define DependenciesResolver for every test
Drop redundant template files

idea/testData/script/definition/navigation/kotlinLibWithSources/script.kts

@@ -1,3 +1,6 @@
 test.KObject.<caret>foo()
+
+// DEPENDENCIES: classpath:lib-classes; sources:lib-source
+
 // REF: (in test.KObject).foo()
 // FILE: test/custom.kt