Bazel: Drop unused WORKSPACE after bzlmod migration

The previous change migrated the build to Bazel modules and removed
all dependencies on the WORKSPACE-based setup.

The WORKSPACE file is now unused and can be safely removed to avoid
confusion.

Change-Id: I2866c22d304c68a29db1989342b6e5055d27a08a

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
deleted file mode 100644
index a07f6e7..0000000
--- a/WORKSPACE
+++ /dev/null
@@ -1,19 +0,0 @@
-workspace(name = "javamelody")
-
-load("//:bazlets.bzl", "load_bazlets")
-
-load_bazlets(
-    commit = "0f81174e3d1b892a1342ebc75bb4bbb158ae0efe",
-    #local_path = "/home/<user>/projects/bazlets",
-)
-
-load(
-    "@com_googlesource_gerrit_bazlets//:gerrit_api.bzl",
-    "gerrit_api",
-)
-
-gerrit_api(version = "3.3.0-SNAPSHOT")
-
-load("//:external_plugin_deps.bzl", "external_plugin_deps")
-
-external_plugin_deps()