Use go:generate for generating cheatsheets

This has several benefits:
- it's less code
- we're using the same mechanism to generate all our auto-generated files, so if
  someone wants to add a new one, it's clear which pattern to follow
- we can re-generate all generated files with a single command
  ("go generate ./...", or "make generate")
- we only need a single check on CI to check that all files are up to date (see
  previous commit)

.github/workflows/ci.yml

@@ -127,9 +127,6 @@ jobs:
         uses: actions/setup-go@v4
         with:
           go-version: 1.20.x
-      - name: Check Cheatsheet
-        run: |
-          go run scripts/cheatsheet/main.go check
       - name: Check Vendor Directory
         # ensure our vendor directory matches up with our go modules
         run: |