Refactor JS test suite to be more in line with other Java projects.

Therefore, we move the test suite out of the `src` directory.

javascript/extractor/BUILD.bazel

@@ -1,9 +1,10 @@
 load("@//:common.bzl", "codeql_fat_jar", "codeql_java_project")
 load("@rules_pkg//pkg:mappings.bzl", "pkg_files")
 
-codeql_java_project(
-    name = "extractor",
-    deps = [
+java_library(
+    name = "deps",
+    visibility = [":__subpackages__"],
+    exports = [
         "@//extractor:html",
         "@//extractor:yaml",
         "@//resources/lib/java:commons-compress",
@@ -11,7 +12,6 @@ codeql_java_project(
         "@//resources/lib/java:jericho-html",
         "@//resources/lib/java:slf4j-api",
         "@//resources/lib/java:snakeyaml",
-        "@//resources/lib/java/DO_NOT_DISTRIBUTE:junit",
         "@//third_party:jackson",
         "@//third_party:logback",
         "@//util-java7",
@@ -19,6 +19,13 @@ codeql_java_project(
     ],
 )
 
+codeql_java_project(
+    name = "extractor",
+    deps = [
+        ":deps",
+    ],
+)
+
 pkg_files(
     name = "javascript-extractor-resources",
     srcs = glob(["resources/**"]),