Only single native image is built at a time (#11497)

#10783 introduced another definition of a buildnativeimage task. Since that time, our CI is transiently failing on out of memory error. This PR ensures that there can be just a single `buildNativeImage` task running at a time.

# Important Notes
Manually tested by running
```
sbt:enso> all engine-runner/buildNativeImage project-manager/buildNativeImage
```
And looking at spawn subprocesses. On develop, I have two `native-image` processes, on this PR, there is just a single one.

build.sbt

@@ -106,6 +106,11 @@ ThisBuild / publish / skip := true
 val simpleLibraryServerTag = Tags.Tag("simple-library-server")
 Global / concurrentRestrictions += Tags.limit(simpleLibraryServerTag, 1)
 
+/** Tag limiting the concurrent spawning of `native-image` subprocess.
+  */
+val nativeImageBuildTag = NativeImage.nativeImageBuildTag
+Global / concurrentRestrictions += Tags.limit(nativeImageBuildTag, 1)
+
 lazy val gatherLicenses =
   taskKey[Unit](
     "Gathers licensing information for relevant dependencies of all distributions"

project/NativeImage.scala

@@ -49,6 +49,12 @@ object NativeImage {
 
   val NATIVE_IMAGE_ARG_FILE = "native-image-args.txt"
 
+  /** Tag limiting the concurrent access to `native-image` subprocess spawning, i.e.,
+    * there should be just a single such subprocess. This should ensure that we do
+    * not run out of memory.
+    */
+  val nativeImageBuildTag = Tags.Tag("native-image-build")
+
   /** Creates a task that builds a native image for the current project.
     *
     * This task must be setup in such a way that the assembly JAR is built
@@ -262,6 +268,7 @@ object NativeImage {
       }
       log.info(s"$targetLoc native image build successful.")
     }
+    .tag(nativeImageBuildTag)
     .dependsOn(Compile / compile)
 
   /** Creates a task which watches for changes of any compiled files or