send buildevent spans for this pipeline (#10334)

the `replayio/buildevents` plugin referenced here will send a span for the containing buildkite step, and the flyvm plugin also includes the buildevents plugin for use within commands run on the flyvm, so this change gives us this in our build traces:

![image](https://github.com/replayio/devtools/assets/24245/ffd9a4ed-658a-46a2-bf4e-4057b5eecbe6)

.buildkite/runtime-tests.yml

@@ -2,7 +2,10 @@ steps:
   - label: "Runtime e2e tests (linux-x86_64)"
     timeout_in_minutes: 60
     key: "runtime-fe-e2e-tests-linux_x86_64"
-    command: "npm i -g yarn && yarn install && ts-node ./packages/e2e-tests/scripts/buildkite_run_fe_tests_from_artifact-linux-x86_64.ts"
+    commands:
+      - "be_cmd install_yarn -- npm i -g yarn"
+      - "be_cmd node_deps -- yarn install"
+      - "be_cmd run_tests -- ts-node ./packages/e2e-tests/scripts/buildkite_run_fe_tests_from_artifact-linux-x86_64.ts"
     agents:
       - "deploy=true"
     plugins:
@@ -22,8 +25,10 @@ steps:
             BUILD_USER_SECRET_ACCESS_KEY:
               secret-id: "prod/build-user"
               json-key: ".secret_access_key"
-            BUILDEVENT_APIKEY: honeycomb-api-key
             RUNTIME_TEAM_API_KEY: runtime-replay-api-key
+            BUILDEVENT_APIKEY: honeycomb-api-key
+            BUILDEVENT_BUILDKITE_API_TOKEN: buildkite-api-token-honeycomb-build-events
+      - replayio/buildevents#76b6f57: ~
       - "ssh://git@github.com/replayio/fly-buildkite-plugin.git#v0.77":
           # This image's source code is here https://github.com/replayio/backend-e2e-base-image
           image: "registry.fly.io/buildkite-backend-e2e-tests:v14"