Remove dependency order workaround for kotlinx-serialization plugin

Current workaround is not working with platform (bom) and since 1.8.0
release kotlinx-serialization was migrated to IR which removed need for
workaround.

^KT-54691 In Progress

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/SubpluginsIT.kt

@@ -196,36 +196,6 @@ class SubpuginsIT : KGPBaseTest() {
         }
     }
 
-    @DisplayName("KT-47921: serialization plugin passed first to the compiler")
-    @GradleTest
-    fun testSerializationPluginOrderedFirst(gradleVersion: GradleVersion) {
-        project("allOpenSimple", gradleVersion) {
-            // Ensure that there are also allopen, noarg, and serialization plugins applied:
-            buildGradle.modify {
-                """
-                |plugins {
-                |    id "org.jetbrains.kotlin.plugin.noarg"
-                |    id "org.jetbrains.kotlin.plugin.serialization"
-                |${it.substringAfter("plugins {")}
-                """.trimMargin()
-            }
-
-            build(
-                "compileKotlin",
-                buildOptions = defaultBuildOptions.copy(logLevel = LogLevel.DEBUG)
-            ) {
-                val xPlugin = output
-                    .split(" ")
-                    .single { it.startsWith("-Xplugin") }
-                    .substringAfter("-Xplugin")
-                    .split(",")
-                assertTrue(xPlugin.first().contains("serialization")) {
-                    "Expected serialization plugin to go first; actual order: $xPlugin"
-                }
-            }
-        }
-    }
-
     @DisplayName("KT-51378: Using 'kotlin-dsl' with latest plugin version in buildSrc module")
     @GradleTestVersions(
         minVersion = TestVersions.Gradle.G_6_8 // Gradle usage of sam-with-receivers subplugin was added in this version

libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/internal/compilerPluginUtils.kt

@@ -1,35 +0,0 @@
-/*
- * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
- * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
- */
-
-package org.jetbrains.kotlin.gradle.internal
-
-import org.gradle.api.artifacts.Configuration
-import org.gradle.api.artifacts.Dependency
-import org.gradle.api.artifacts.ModuleDependency
-
-/**
- * Reorder the compiler plugin dependencies in this [Configuration] so that dependencies on the
- * modules under [prioritizedPluginArtifactCoordinates] appear first.
- *
- * In particular, the serialization plugin needs to appear first on the -Xplugin classpath in order to avoid conflicts with other compiler
- * plugins producing unexpected IR.
- *
- * KT-47921
- */
-internal fun Configuration.reorderPluginClasspathDependencies() {
-    withDependencies { dependencySet ->
-        val orderedDependencies = dependencySet.toList().partition(Dependency::isPrioritized).toList().flatten()
-        dependencySet.clear()
-        dependencySet.addAll(orderedDependencies)
-    }
-}
-
-private val Dependency.isPrioritized: Boolean
-    get() = this is ModuleDependency && (group to name) in prioritizedPluginArtifactCoordinates
-
-private val prioritizedPluginArtifactCoordinates = setOf(
-    "org.jetbrains.kotlin" to "kotlin-serialization",
-    "org.jetbrains.kotlin" to "kotlin-serialization-unshaded"
-)

libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/plugin/mpp/compilationImpl/factory/KotlinCompilationDependencyConfigurationsFactories.kt

@@ -7,7 +7,6 @@ package org.jetbrains.kotlin.gradle.plugin.mpp.compilationImpl.factory
 
 import org.gradle.api.attributes.Category
 import org.gradle.api.attributes.Usage
-import org.jetbrains.kotlin.gradle.internal.reorderPluginClasspathDependencies
 import org.jetbrains.kotlin.gradle.plugin.*
 import org.jetbrains.kotlin.gradle.plugin.mpp.KotlinUsages
 import org.jetbrains.kotlin.gradle.plugin.mpp.KotlinWithJavaTarget
@@ -227,7 +226,6 @@ private fun KotlinCompilationDependencyConfigurationsContainer(
         isVisible = false
         isCanBeConsumed = false
         description = "Kotlin compiler plugins for $compilation"
-        reorderPluginClasspathDependencies()
     }
 
     return DefaultKotlinCompilationConfigurationsContainer(

libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/plugin/mpp/pm20/compilerPluginProvider.kt

@@ -7,7 +7,6 @@ package org.jetbrains.kotlin.gradle.plugin.mpp.pm20
 
 import org.gradle.api.Project
 import org.gradle.api.provider.Provider
-import org.jetbrains.kotlin.gradle.internal.reorderPluginClasspathDependencies
 import org.jetbrains.kotlin.gradle.plugin.FilesSubpluginOption
 import org.jetbrains.kotlin.gradle.plugin.SubpluginOption
 import org.jetbrains.kotlin.gradle.tasks.CompilerPluginOptions
@@ -94,7 +93,6 @@ private class CompilerPluginOptionsBuilder(
                 isCanBeConsumed = false
                 isCanBeResolved = true
                 isVisible = false
-                reorderPluginClasspathDependencies()
                 addGradlePluginMetadataAttributes(project)
             }
         artifacts.forEach { project.dependencies.add(configurationName, it) }