Migrate Fuchsia ANGLE compile targets.

This removes the final references to the Chromium-based ANGLE
GTests from CI. After this we can switch ANGLE over to building
standalone tests by default.

Bug: angleproject:5124
Change-Id: I1577318ee0883cd76dceb43bbe5b0b3e29b43e82
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2491518
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#820124}

testing/buildbot/chromium.gpu.fyi.json

@@ -7981,8 +7981,8 @@
   },
   "GPU FYI Fuchsia Builder": {
     "additional_compile_targets": [
-      "angle_end2end_tests",
-      "angle_unittests"
+      "standalone_angle_end2end_tests",
+      "standalone_angle_unittests"
     ]
   },
   "GPU FYI Linux Builder": {},

testing/buildbot/gn_isolate_map.pyl

@@ -116,20 +116,11 @@
     "label": "//third_party/angle:angle_apks",
     "type": "additional_compile_target",
   },
-  "angle_end2end_tests": {
-    "args": [],
-    "label": "//third_party/angle/src/tests:angle_end2end_tests",
-    "type": "windowed_test_launcher",
-  },
   "angle_restricted_trace_gold_tests": {
     "type": "script",
     "label": "//third_party/angle/src/tests/restricted_traces:angle_restricted_trace_gold_tests",
     "script": "//third_party/angle/src/tests/restricted_traces/restricted_trace_gold_tests.py",
   },
-  "angle_unittests": {
-    "label": "//third_party/angle/src/tests:angle_unittests",
-    "type": "console_test_launcher",
-  },
   "app_list_unittests": {
     "label": "//ash/app_list:app_list_unittests",
     "type": "windowed_test_launcher",

testing/buildbot/waterfalls.pyl

@@ -3712,8 +3712,8 @@
       },
       'GPU FYI Fuchsia Builder' : {
         'additional_compile_targets': [
-          'angle_end2end_tests',
-          'angle_unittests',
+          'standalone_angle_end2end_tests',
+          'standalone_angle_unittests',
         ],
       },
       'GPU FYI Linux Builder' : {},