Drop await usage for now-synchronous encodeFileToken() (#11612)

### Remove unnecessary `await` from `encodeFileToken` calls (now
synchronous) #11611

####  Context

In [PR #11385 – commit
26c17f3](https://github.com/twentyhq/twenty/pull/11385/commits/26c17f3205eb0cf4b93dd37cfec97638596ed263),
`FileService.encodeFileToken()` was updated to be a **synchronous**
method. However, several places in the codebase were still calling it
using `await`.

####  Changes 
This PR cleans up those redundant `await` usages to:
- Improve clarity
- Avoid confusion (no longer awaiting a non-Promise)
- Slightly reduce overhead in affected functions
- Removed `await` from calls to `this.fileService.encodeFileToken(...)`

packages/twenty-server/src/engine/api/graphql/workspace-query-runner/factories/query-result-getters/handlers/activity-query-result-getter.handler.ts

@@ -53,7 +53,7 @@ export class ActivityQueryResultGetterHandler
 
         imageUrl.searchParams.delete('token');
 
-        const signedPayload = await this.fileService.encodeFileToken({
+        const signedPayload = this.fileService.encodeFileToken({
           noteBlockId: block.id,
           workspaceId: workspaceId,
         });

packages/twenty-server/src/engine/api/graphql/workspace-query-runner/factories/query-result-getters/handlers/attachment-query-result-getter.handler.ts

@@ -16,7 +16,7 @@ export class AttachmentQueryResultGetterHandler
       return attachment;
     }
 
-    const signedPayload = await this.fileService.encodeFileToken({
+    const signedPayload = this.fileService.encodeFileToken({
       attachmentId: attachment.id,
       workspaceId: workspaceId,
     });

packages/twenty-server/src/engine/api/graphql/workspace-query-runner/factories/query-result-getters/handlers/person-query-result-getter.handler.ts

@@ -16,7 +16,7 @@ export class PersonQueryResultGetterHandler
       return person;
     }
 
-    const signedPayload = await this.fileService.encodeFileToken({
+    const signedPayload = this.fileService.encodeFileToken({
       personId: person.id,
       workspaceId: workspaceId,
     });