Add CLI module deduplication and improve conflict reporting

Individual CLI modules now silently take precedence over array-sourced
modules (e.g. from cli-defaults) when their commands overlap. Conflict
errors between non-array modules include both package names for easier
debugging.

Commands reference their parent module instead of storing a raw package
name string. createCliModule now validates that packageJson has a name.

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

packages/cli-defaults/report.api.md

@@ -0,0 +1,13 @@
+## API Report File for "@backstage/cli-defaults"
+
+> Do not edit this file. It is a report generated by [API Extractor](https://api-extractor.com/).
+
+```ts
+import { CliModule } from '@backstage/cli-node';
+
+// @public
+const _default: CliModule[];
+export default _default;
+
+// (No @packageDocumentation comment for this package)
+```

packages/cli-defaults/src/index.ts

@@ -25,6 +25,11 @@ import newModule from '@backstage/cli-module-new';
 import testJest from '@backstage/cli-module-test-jest';
 import translations from '@backstage/cli-module-translations';
 
+/**
+ * The default set of CLI modules for the Backstage CLI.
+ *
+ * @public
+ */
 export default [
   auth,
   build,