avoid lazy race conditions (#1364)

We had a few issues with lazy race conditions failing CI. This came from
scripts configured to invoke lazy again, rather than through expressing
dependencies between scripts.

This diff reconfigures lazy to articulate these sorts of things as
dependencies instead of through self-invocation. Instead of having lots
of separate `build-package`, `build-docs`, etc commands, we now just
have a build command with package overrides to express more specific
options

### Change Type
- [x] `internal` — Any other changes that don't affect the published
package (will not publish a new version)

### Release Notes
[internal only]

scripts/prepack.ts

@@ -12,7 +12,7 @@ export async function preparePackage({ sourcePackageDir }: { sourcePackageDir: s
 
 	const manifest = JSON.parse(readFileSync(path.join(sourcePackageDir, 'package.json'), 'utf8'))
 
-	execSync('yarn run -T lazy build-package', { cwd: sourcePackageDir, stdio: 'inherit' })
+	execSync('yarn run -T lazy build', { cwd: sourcePackageDir, stdio: 'inherit' })
 
 	// save package.json and reinstate it in postpack
 	copyFileSync(