Fix signing in :kotlin-annotation-processing-embeddable

Problem is reproducible only when singing is enabled.
Register dependencies between publication and signing tasks.
It looks like signing tasks have same output and need to be registered
in all publications.

Error:

* What went wrong:
Some problems were found with the configuration of task ':kotlin-annotation-processing-embeddable:publishMainPublicationToMavenLocal' (type 'PublishToMavenLocal').
  - Gradle detected a problem with the following location: '/Users/Shared/Projects/kotlin/plugins/kapt3/kotlin-annotation-processing-embeddable/build/libs/kotlin-annotation-processing-embeddable-1.9.255-SNAPSHOT-sources.jar.asc'.

    Reason: Task ':kotlin-annotation-processing-embeddable:publishMainPublicationToMavenLocal' uses this output of task ':kotlin-annotation-processing-embeddable:signGradleCompatPublication' without declaring an explicit or implicit dependency. This can lead to incorrect results being produced, depending on what order the tasks are executed.

Reproduce:

gradle :kotlin-annotation-processing-embeddable:publishToMavenLocal -Psigning.gnupg.keyName=* -Psigning.gnupg.passphrase=* -PsigningRequired=true

KTI-1282

plugins/kapt3/kotlin-annotation-processing-embeddable/build.gradle.kts

@@ -2,6 +2,7 @@ import org.gradle.api.publish.internal.PublicationInternal
 import org.jetbrains.kotlin.util.capitalizeDecapitalize.capitalizeAsciiOnly
 import plugins.KotlinBuildPublishingPlugin.Companion.ADHOC_COMPONENT_NAME
 import plugins.configureKotlinPomAttributes
+import plugins.signLibraryPublication
 
 description = "Annotation Processor for Kotlin (for using with embeddable compiler)"
 
@@ -26,6 +27,21 @@ val gradleCompatPublication = publications.register<MavenPublication>("gradleCom
     (this as PublicationInternal<*>).isAlias = true
     configureKotlinPomAttributes(project)
 }
+if (signLibraryPublication) {
+    tasks.named("publishGradleCompatPublicationToMavenLocal").configure {
+        dependsOn("signMainPublication")
+    }
+    tasks.named("publishGradleCompatPublicationToMavenRepository").configure {
+        dependsOn("signMainPublication")
+    }
+    tasks.named("publishMainPublicationToMavenLocal").configure {
+        dependsOn("signGradleCompatPublication")
+    }
+    tasks.named("publishMainPublicationToMavenRepository").configure {
+        dependsOn("signGradleCompatPublication")
+    }
+}
+
 val targetName = "${gradleCompatPublication.name.capitalizeAsciiOnly()}Publication"
 configureSbom(
     target = targetName,