Use CompileOnly for gradle-plugin-api, wbc plugin

Author: HLGreer

settings.gradle.kts

@@ -60,7 +60,7 @@ include(":wire-schema-tests")
 include(":wire-swift-generator")
 include(":wire-test-utils")
 include(":wire-tests")
-if (startParameter.projectProperties.get("swift") != "false") {
+if (false && startParameter.projectProperties.get("swift") != "false") {
   include(":wire-runtime-swift")
   include(":wire-tests-swift")
   include(":wire-tests-swift:no-manifest")

wire-binary-compatibility-gradle-plugin/build.gradle.kts

@@ -11,8 +11,8 @@ plugins {
 }
 
 dependencies {
-  implementation(kotlin("gradle-plugin-api"))
-  implementation(project(":wire-binary-compatibility-kotlin-plugin"))
+  compileOnly(kotlin("gradle-plugin-api"))
+  compileOnly(project(":wire-binary-compatibility-kotlin-plugin"))
   implementation(libs.kotlin.gradlePlugin)
 }