Remove multi config runApplication extension

Closes gh-10511

spring-boot-project/spring-boot/src/main/kotlin/org/springframework/boot/SpringApplicationExtensions.kt

@@ -42,16 +42,3 @@ inline fun <reified T : Any> runApplication(vararg args: String): ConfigurableAp
  */
 inline fun <reified T : Any> runApplication(vararg args: String, init: SpringApplication.() -> Unit): ConfigurableApplicationContext =
 		SpringApplication(T::class.java).apply(init).run(*args)
-
-
-/**
- * Top level function acting as a Kotlin shortcut allowing to write
- * `runApplication(arrayOf(FooApplication::class, FooConfiguration::class), arg1, arg2) { // Optional SpringApplication customization ... }`
- * instead of instantiating `SpringApplication` class, customize it and then invoking
- * `run(arrayOf(arg1, arg2))`.`
- *
- * @author Sebastien Deleuze
- * @since 2.0.0
- */
-fun runApplication(primarySources: Array<KClass<*>>, vararg args: String, init: SpringApplication.() -> Unit = {}): ConfigurableApplicationContext =
-		SpringApplication(*primarySources.map { it.java }.toTypedArray()).apply(init).run(*args)

spring-boot-project/spring-boot/src/test/kotlin/org/springframework/boot/SpringApplicationExtensionsTests.kt

@@ -70,42 +70,6 @@ class SpringApplicationExtensionsTests {
 		assertEquals(environment, context.environment)
 	}
 
-	@Test
-	fun `Kotlin runApplication(array of KClass) top level function`() {
-		val context = runApplication(arrayOf(ExampleConfig::class, ExampleWebConfig::class))
-		assertNotNull(context)
-	}
-
-	@Test
-	fun `Kotlin runApplication(array of KClass) top level function with a custom environment`() {
-		val environment = StandardEnvironment()
-		val context = runApplication(arrayOf(ExampleConfig::class, ExampleWebConfig::class)) {
-			setEnvironment(environment)
-		}
-		assertNotNull(context)
-		assertEquals(environment, context.environment)
-	}
-
-	@Test
-	fun `Kotlin runApplication(array of KClass, arg1, arg2) top level function`() {
-		val context = runApplication(arrayOf(ExampleConfig::class, ExampleWebConfig::class), "--debug", "spring", "boot")
-		val args = context.getBean<ApplicationArguments>()
-		assertArrayEquals(arrayOf("spring", "boot"), args.nonOptionArgs.toTypedArray())
-		assertTrue(args.containsOption("debug"))
-	}
-
-	@Test
-	fun `Kotlin runApplication(array of KClass, arg1, arg2) top level function with a custom environment`() {
-		val environment = StandardEnvironment()
-		val context = runApplication(arrayOf(ExampleConfig::class, ExampleWebConfig::class), "--debug", "spring", "boot") {
-			setEnvironment(environment)
-		}
-		val args = context.getBean<ApplicationArguments>()
-		assertArrayEquals(arrayOf("spring", "boot"), args.nonOptionArgs.toTypedArray())
-		assertTrue(args.containsOption("debug"))
-		assertEquals(environment, context.environment)
-	}
-
 
 	@Configuration
 	internal open class ExampleConfig