Investigate and fix sporadic fail of `AuthenticatedAsset` E2E tests

[UMR1352]

Description

Investigate and fix the sporadic fail of E2E tests:

• asset::accepting_the_transfer_of_an_asset_requires_capability
• asset::transferring_asset_works
  Both tests fail with the error: transaction returned an unexpected response; no proposal was created in this transaction.

Motivation

The flaky behavior of these tests hinders our CI.

[wulfraem]

A possible workaround could be to await the finality of the transactions, similar to #1539.