migrate 3 fbcode-only TARGETS dirs with placeholder BUCK siblings (#21066)

Summary:
Pull Request resolved: #21066

Chunk 7A of fbcode/executorch TARGETS->BUCK migration. 3 directories where:
  - TARGETS contained substantial fbcode-only build rules
    (`fbcode_macros`, `cpp_library`, `cpp_unittest`, etc.)
  - BUCK was a 4-5-line placeholder (e.g. "empty BUCK file to unblock landing")
  - No targets.bzl existed yet

Same transform as chunk 6: created a new `targets.bzl` with the original
loads and a `define_common_targets(is_fbcode = False)` function whose body
opens with `if not is_fbcode: return`. Overwrote the placeholder BUCK
with a thin caller that loads `fbsource_utils.is_fbcode()` and calls
`define_common_targets(is_fbcode = is_fbcode())`.

Directories migrated:
  - exir/dialects/edge/test
  - exir/tests
  - test/end2end

Differential Revision: D109082045

Author: bigfootjon

exir/dialects/edge/test/BUCK

@@ -1,4 +1,9 @@
-# add this empty BUCK file to unblock landing. Without this, we get land error:
-#   "No build file at xplat/executorch/exir/dialects/edge/test/BUCK when resolving target fbsource//xplat/executorch/exir/dialects/edge/test:."
+# Any targets that should be shared between fbcode and xplat must be defined in
+# targets.bzl.
+
+load("@fbsource//tools/build_defs:fbsource_utils.bzl", "is_fbcode")
+load(":targets.bzl", "define_common_targets")
 
 oncall("executorch")
+
+define_common_targets(is_fbcode = is_fbcode())

exir/dialects/edge/test/TARGETS

@@ -0,0 +1,34 @@
+load("@fbcode_macros//build_defs:python_unittest.bzl", "python_unittest")
+
+def define_common_targets(is_fbcode = False):
+    if not is_fbcode:
+        return
+
+    python_unittest(
+        name = "test_edge_yaml",
+        srcs = [
+            "test_edge_yaml.py",
+        ],
+        resources = {
+            "//executorch/exir/dialects/edge:edge_yaml": "edge.yaml",
+        },
+        labels = ["long_running"],
+        deps = [
+            "fbsource//third-party/pypi/expecttest:expecttest",  # @manual
+            "//caffe2:torch",
+            "//executorch/exir/dialects/edge/dtype:lib",
+            "//executorch/exir/dialects/edge/spec:lib",
+        ],
+    )
+
+    python_unittest(
+        name = "test_edge_ops",
+        srcs = [
+            "test_edge_ops.py",
+        ],
+        deps = [
+            "//caffe2:torch",
+            "//executorch/exir/dialects:lib",
+            "//executorch/exir/dialects/edge:lib",
+        ],
+    )

exir/dialects/edge/test/targets.bzl

@@ -1,4 +1,9 @@
-# add this empty BUCK file to unblock landing. Without this, we get land error:
-#   "No build file at xplat/executorch/exir/tests/BUCK when resolving target fbsource//xplat/executorch/exir/tests:."
+# Any targets that should be shared between fbcode and xplat must be defined in
+# targets.bzl.
+
+load("@fbsource//tools/build_defs:fbsource_utils.bzl", "is_fbcode")
+load(":targets.bzl", "define_common_targets")
 
 oncall("executorch")
+
+define_common_targets(is_fbcode = is_fbcode())