Remove extra exports from CLI module packages

CLI modules should only export the module itself as a default export.
Remove the named `buildPlugin` export from cli-module-build and the
unused `configOption` export from cli-module-config. Also remove the
API report warning skip for CLI module packages.

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>
Made-with: Cursor

packages/cli-module-build/report.api.md

@@ -5,12 +5,9 @@
 ```ts
 import { CliModule } from '@backstage/cli-node';
 
-// Warning: (ae-missing-release-tag) "buildPlugin" is part of the package's API, but it is missing a release tag (@alpha, @beta, @public, or @internal)
-//
 // @public (undocumented)
-const buildPlugin: CliModule;
-export { buildPlugin };
-export default buildPlugin;
+const _default: CliModule;
+export default _default;
 
 // (No @packageDocumentation comment for this package)
 ```

packages/cli-module-build/src/index.ts

@@ -17,7 +17,7 @@
 import { createCliModule } from '@backstage/cli-node';
 import packageJson from '../package.json';
 
-export const buildPlugin = createCliModule({
+export default createCliModule({
   packageJson,
   init: async reg => {
     reg.addCommand({
@@ -85,5 +85,3 @@ export const buildPlugin = createCliModule({
     });
   },
 });
-
-export default buildPlugin;