Do signing only if it's explicitly stated so in parameters

KTI-1377

repo/gradle-build-conventions/buildsrc-compat/src/main/kotlin/plugins/KotlinBuildPublishingPlugin.kt

@@ -133,7 +133,6 @@ fun MavenPublication.configureKotlinPomAttributes(project: Project, explicitDesc
 val Project.signLibraryPublication: Boolean
     get() = project.providers.gradleProperty("signingRequired").orNull?.toBoolean()
         ?: project.providers.gradleProperty("kotlin.build.signing-required").orNull?.toBoolean()
-        ?: project.providers.gradleProperty("isSonatypeRelease").orNull?.toBoolean()
         ?: false
 
 // overload for Groovy

repo/gradle-build-conventions/buildsrc-compat/src/main/kotlin/preparePublication.kt

@@ -19,7 +19,6 @@ fun Project.preparePublication() {
         val repo: String? = properties["kotlin.build.deploy-repo"]?.toString() ?: properties["deploy-repo"]?.toString()
         val repoProvider = repositoryProviders.getOrDefault(repo, repo)
         val isSonatypePublish: Boolean by extra(repoProvider == "sonatype")
-        val isSonatypeRelease: Boolean by extra(isSonatypePublish && isRelease)
 
         val deployRepoUrl = (properties["kotlin.build.deploy-url"] ?: properties["deploy-url"])?.toString()?.takeIf { it.isNotBlank() }