Remove Buildkite unit/lint tests from expeditor config

**NOTE**: Don't merge this without:
- removing 'verify' from the 'required checks' in the GH conifg
- ADDING 'all checks' to the 'required checks' in the GH config

Now that unit/lint tests are matched on GH to BK, we can remove
the ones on BK, which are slower and cause more issues.

This ALSO adds the 'all checks' check so we can easily just tell
GH to block merges on that passing.

Signed-off-by: Phil Dibowitz <phil@ipom.com>

Author: jaymzh

.expeditor/config.yml

@@ -44,8 +44,3 @@ subscriptions:
     actions:
       - built_in:rollover_changelog
       - built_in:publish_rubygems
-
-pipelines:
-  - verify:
-      description: Pull Request validation tests
-      public: true

.expeditor/run_linux_tests.sh

@@ -0,0 +1,19 @@
+name: All checks pass
+on:
+  pull_request:
+    types: [ opened, synchronize, reopened, ready_for_review ]
+
+jobs:
+  allchecks:
+    runs-on: ubuntu-latest
+    permissions:
+      checks: read
+      contents: read
+    steps:
+      - uses: wechuli/allcheckspassed@v1
+        with:
+          # This seems to be working lately even for external
+          # contributors, so maybe we don't need to exclude it?
+          checks_exclude: "SonarCloud Code Analysis"
+          # Retry every minute for 30 minutes...
+          retries: 30

.expeditor/run_windows_tests.ps1

@@ -1,6 +1,6 @@
 # Chef Zero
 
-[![Build status](https://badge.buildkite.com/943881fa8cbc4bede24eebf34685a49fecd39ea88a316f60b1.svg?branch=master)](https://buildkite.com/chef-oss/chef-chef-zero-master-verify)
+[![Build status](https://github.com/chef/chef-zero/actions/workflows/allchecks.yml/badge.svg)](https://github.com/chef/chef-zero/actions/workflows/allchecks.yml)
 [![Gem Version](https://badge.fury.io/rb/chef-zero.svg)](http://badge.fury.io/rb/chef-zero)
 
 ## Description