[ExecuTorch] Arm Ethos: Add ArmTester TARGET

Pull Request resolved: #8560

As title.
ghstack-source-id: 268178174
@exported-using-ghexport

@bypass-github-export-checks
@bypass-github-pytorch-ci-checks
@bypass-github-executorch-ci-checks

Differential Revision: [D69714022](https://our.internmc.facebook.com/intern/diff/D69714022/)

Author: digantdesai

backends/arm/test/TARGETS

@@ -32,3 +32,17 @@ python_library(
         "fbsource//third-party/pypi/pytest:pytest",
     ]
 )
+
+python_library(
+    name = "arm_tester",
+    srcs = glob(["tester/*.py"]),
+    deps = [
+        ":runner_utils",
+        ":common",
+        "//executorch/backends/arm:tosa_mapping",
+        "//executorch/backends/arm:tosa_specification",
+        "//executorch/backends/arm/quantizer:arm_quantizer",
+        "//executorch/devtools/backend_debug:delegation_info",
+        "fbsource//third-party/pypi/tabulate:tabulate",
+    ]
+)