Remove approval block to run tests, lint, and annotations

These steps are designed so any code executed from the workspace happens
inside an unprivileged docker container.

We would get faster feedback on PRs if these run instantly.

pipelines/buildkite-config/initial.yml

@@ -4,16 +4,6 @@
 # This config is intended for running the rails/buildkite-config CI.
 
 steps:
-  - block: "Review Build Script"
-    branches: "!main"
-    prompt: |
-      Our CI scripts run outside the docker containers, which are a necessary security layer.
-
-      Approving a build here is equivalent to copy & pasting it into a production ssh window.
-
-      Prefer a second opinion for any nontrivial change, especially outside `pipeline-generate`.
-
-      - @matthewd
   - group:
     label: ":pipeline: buildkite-config meta-ci"
     key: "meta"