Fix compileAll convenience task (#780)

Moving the task to the conventions plugin fixes the issue that not all compilation tasks were run.

Author: snazy

build.gradle.kts

@@ -96,11 +96,3 @@ idea.project.settings {
     )
   }
 }
-
-subprojects.forEach {
-  it.tasks.register("compileAll").configure {
-    group = "build"
-    description = "Runs all compilation and jar tasks"
-    dependsOn(tasks.withType<AbstractCompile>(), tasks.withType<ProcessResources>())
-  }
-}

buildSrc/src/main/kotlin/cel-conventions.gradle.kts

@@ -29,3 +29,9 @@ apply<CelCodeCoveragePlugin>()
 if (projectDir.resolve("src/test/java").exists()) {
   nessieConfigureTestTasks()
 }
+
+tasks.register("compileAll").configure {
+  group = "build"
+  description = "Runs all compilation and jar tasks"
+  dependsOn(tasks.withType<AbstractCompile>(), tasks.withType<ProcessResources>())
+}