Grafana/data: Fix theme types schema resolution (#116240)

* fix(grafana-data): copy theme schema json to types so declaration resolves

* refactor(grafana-data): move node scripts out of source code

* feat(grafana-data): generate types for theme schema

* chore(codeowners): update for grafana-data/scripts file move

* feat(grafana-data): put back copy plugin for theme json files

* revert(grafana-data): remove definition output

* feat(grafana-data): make builds great again

* minor tidy up

---------

Co-authored-by: Ashley Harrison <ashley.harrison@grafana.com>

packages/grafana-data/scripts/generateSchema.ts

@@ -0,0 +1,22 @@
+import fs from 'node:fs';
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+import { NewThemeOptionsSchema } from '../src/themes/createTheme';
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+const jsonOut = path.join(__dirname, '..', 'src', 'themes', 'schema.generated.json');
+
+fs.writeFileSync(
+  jsonOut,
+  JSON.stringify(
+    NewThemeOptionsSchema.toJSONSchema({
+      target: 'draft-07',
+    }),
+    undefined,
+    2
+  )
+);
+
+console.log('Successfully generated theme schema');