fix: add deprecated tag back to callBackgroundMethod (#25216)

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## **Description**
Removed wrongly in
#21410, this PR aims
to add `deprecated` tag back to `callBackgroundMethod` for migration
purpose.

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ui/store/background-connection.ts

@@ -41,6 +41,7 @@ type CallbackMethod<R = unknown> = (error?: unknown, result?: R) => void;
  * [Deprecated] Callback-style call to background method
  * invokes promisifiedBackground method directly.
  *
+ * @deprecated Use async `submitRequestToBackground` function instead.
  * @param method - name of the background method
  * @param [args] - arguments to that method, if any
  * @param callback - Node style (error, result) callback for finishing the operation