chore: switch from flakybot to buildcop (via synth) (#159)

This PR was generated using Autosynth. 🌈

Synth log will be available here:
https://source.cloud.google.com/results/invocations/fdb52ec7-8162-4605-a0be-a825994accd2/targets

- [ ] To automatically regenerate this PR, check this box. (May take up to 24 hours.)

.kokoro/test-samples.sh

@@ -87,11 +87,11 @@ for file in samples/**/requirements.txt; do
     python3.6 -m nox -s "$RUN_TESTS_SESSION"
     EXIT=$?
 
-    # If this is a periodic build, send the test log to the FlakyBot.
-    # See https://github.com/googleapis/repo-automation-bots/tree/master/packages/flakybot.
+    # If this is a periodic build, send the test log to the Build Cop Bot.
+    # See https://github.com/googleapis/repo-automation-bots/tree/master/packages/buildcop.
     if [[ $KOKORO_BUILD_ARTIFACTS_SUBDIR = *"periodic"* ]]; then
-      chmod +x $KOKORO_GFILE_DIR/linux_amd64/flakybot
-      $KOKORO_GFILE_DIR/linux_amd64/flakybot
+      chmod +x $KOKORO_GFILE_DIR/linux_amd64/buildcop
+      $KOKORO_GFILE_DIR/linux_amd64/buildcop
     fi
 
     if [[ $EXIT -ne 0 ]]; then

.kokoro/trampoline_v2.sh

@@ -159,7 +159,7 @@ if [[ -n "${KOKORO_BUILD_ID:-}" ]]; then
 	"KOKORO_GITHUB_COMMIT"
 	"KOKORO_GITHUB_PULL_REQUEST_NUMBER"
 	"KOKORO_GITHUB_PULL_REQUEST_COMMIT"
-	# For FlakyBot
+	# For Build Cop Bot
 	"KOKORO_GITHUB_COMMIT_URL"
 	"KOKORO_GITHUB_PULL_REQUEST_URL"
     )

synth.metadata

@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/python-datastore.git",
-        "sha": "dd6c0ee43fe6763528374a3494de0124de0ee652"
+        "sha": "3c8da54de9a6837d6d96b6befd3b0ef084d8ff7f"
       }
     },
     {