Add checksum to manifest (#17368)

## Refactor app-dev state management and build utilities

- Store only `manifest` in `AppDevState` instead of full
`ManifestBuildResult`; add `sourcePath` to `FileStatus`
- Pass `sourcePaths` directly to watchers instead of
`ManifestBuildResult`
- Only reset `fileUploadStatus` for functions/components when their
source paths change
- Add pure `updateManifestChecksum` utility that returns a new manifest
without side effects
- Extract `processEsbuildResult` to deduplicate build result processing
between watchers
- Rename `serverlessFunctions` → `functions` in SDK code (API unchanged)
- Extract `writeManifestToOutput` to shared `manifest-writer.ts`

packages/twenty-sdk/src/cli/__tests__/integration/utils/normalize-manifest.util.ts

@@ -0,0 +1,20 @@
+import { type ApplicationManifest } from 'twenty-shared/application';
+
+// Replace dynamic checksum values with a placeholder for consistent comparisons
+export const normalizeManifestForComparison = <
+  T extends Partial<ApplicationManifest>,
+>(
+  manifest: T,
+): T => ({
+  ...manifest,
+  functions: manifest.functions?.map((fn) => ({
+    ...fn,
+    builtHandlerChecksum: fn.builtHandlerChecksum ? '[checksum]' : null,
+  })),
+  frontComponents: manifest.frontComponents?.map((component) => ({
+    ...component,
+    builtComponentChecksum: component.builtComponentChecksum
+      ? '[checksum]'
+      : null,
+  })),
+});