Remove unused imports, update comments

Author: IlyaMuravjov

utbot-framework/src/main/kotlin/org/utbot/framework/assemble/AssembleModelGenerator.kt

@@ -205,12 +205,12 @@ class AssembleModelGenerator(private val basePackageName: String) {
                     is UtClassRefModel,
                     is UtVoidModel,
                     is UtEnumConstantModel,
-                    is UtCustomModel -> utModel
+                    is UtCustomModel -> utModel // for example, UtSpringContextModel
                     is UtLambdaModel -> assembleLambdaModel(utModel)
                     is UtArrayModel -> assembleArrayModel(utModel)
                     is UtCompositeModel -> assembleCompositeModel(utModel)
                     is UtAssembleModel -> assembleAssembleModel(utModel)
-                    // Python, JavaScript, UtSpringContextModel are supposed to be here as well
+                    // Python, JavaScript are supposed to be here as well
                     else -> utModel
                 }
             } catch (e: AssembleException) {

utbot-framework/src/main/kotlin/org/utbot/framework/codegen/services/framework/TestFrameworkManager.kt

@@ -25,9 +25,6 @@ import org.utbot.framework.plugin.api.BuiltinMethodId
 import org.utbot.framework.plugin.api.ClassId
 import org.utbot.framework.plugin.api.CodegenLanguage
 import org.utbot.framework.plugin.api.ConstructorId
-import org.utbot.framework.plugin.api.util.SpringModelUtils.extendWithClassId
-import org.utbot.framework.plugin.api.util.SpringModelUtils.runWithClassId
-import org.utbot.framework.plugin.api.util.SpringModelUtils.springExtensionClassId
 import org.utbot.framework.plugin.api.util.booleanArrayClassId
 import org.utbot.framework.plugin.api.util.byteArrayClassId
 import org.utbot.framework.plugin.api.util.charArrayClassId

utbot-framework/src/main/kotlin/org/utbot/framework/plugin/api/TestCaseGenerator.kt

@@ -38,8 +38,6 @@ import org.utbot.framework.util.ConflictTriggers
 import org.utbot.framework.util.SootUtils
 import org.utbot.framework.util.jimpleBody
 import org.utbot.framework.util.toModel
-import org.utbot.framework.plugin.api.SpringSettings.*
-import org.utbot.framework.plugin.api.SpringTestType.*
 import org.utbot.instrumentation.ConcreteExecutor
 import org.utbot.instrumentation.warmup
 import org.utbot.taint.TaintConfigurationProvider