The `Bswup` should not cache the failed responses in passive mode

[msynk]

The Bswup should not cache the failed responses in passive mode:

• currently, all of the responses received in the passive mode fetch requests will be stored regardless of its status code.
• the correct way is to only store the successful responses (with 2xx status codes) like what we did for the caching of the initial assets' requests.

[github-actions]

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