fix(gate): skip unnecessary secret decryption step on SYNC_FORCE_REMOVE (#976)

#### Migration notes

None

- [ ] The change comes with new or modified tests
- [ ] Hard-to-understand functions have explanatory comments
- [ ] End-user documentation is updated to reflect the change


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- **New Features**
- Introduced a secure, improved mechanism for downloading type graph
data, enhancing the retrieval process and ensuring sensitive data is
handled safely.
  
- **Refactor**
- Updated processes to consistently leverage the new download approach,
streamlining functionality and reinforcing robust error handling.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Author: michael-0acf4

src/typegate/src/sync/typegraph.ts

@@ -63,15 +63,23 @@ export class TypegraphStore {
     return id;
   }
 
-  public async download(
+  public async downloadTypegraph(
     id: TypegraphId,
-  ): Promise<[TypeGraphDS, SecretManager]> {
+  ) {
     const key = TypegraphStore.#getKey(id);
     const data = await this.#downloadData(this.bucket, key);
     const [typegraph, encryptedSecrets] = JSON.parse(data) as [
       TypeGraphDS,
       string,
     ];
+
+    return [typegraph, encryptedSecrets] satisfies [TypeGraphDS, string];
+  }
+
+  public async download(
+    id: TypegraphId,
+  ): Promise<[TypeGraphDS, SecretManager]> {
+    const [typegraph, encryptedSecrets] = await this.downloadTypegraph(id);
     const secrets = JSON.parse(await this.cryptoKeys.decrypt(encryptedSecrets));
     const secretManager = new SecretManager(typegraph, secrets);
 

src/typegate/src/typegate/mod.ts

@@ -418,7 +418,7 @@ export class Typegate implements AsyncDisposable {
   ) {
     logger.warn(`Dropping "${name}": started`);
     const typegraphId = typegraphIdSchema.parse(JSON.parse(payload));
-    const [tg] = await typegraphStore.download(
+    const [tg] = await typegraphStore.downloadTypegraph(
       typegraphId,
     );
     const artifacts = new Set(