fix: retry only reqwest errors

[de-sh]

Closes #

Changes

Why?

Downloader retrying issues related to file-system, the actual file being empty, etc. doesn't make much sense, whereas when it is caused by something related to the HTTP client, retrying could help.

Trials Performed

1. HTTP error:

  2023-08-15T10:32:25.912726Z  INFO uplink::base::bridge: Action response = ActionResponse { action_id: "1411", device_id: None, sequence: 1, timestamp: 1692095545912, state: "Downloading", progress: 0, errors: [], done_response: None }

  2023-08-15T10:34:36.865645Z ERROR uplink::collector::downloader: Download failed: error sending request for url (https://firmware.stage.bytebeam.io/api/v1/file/0dd74499-4d79-480b-9892-165497654281/artifact): error trying to connect: tcp connect error: Network is unreachable (os error 101)

  2023-08-15T10:35:06.252073Z  WARN uplink::collector::downloader: Retrying download

2. Non HTTP error:

    2023-08-15T10:23:17.754027Z  INFO uplink::base::bridge: Action response = ActionResponse { action_id: "1406", device_id: None, sequence: 0, timestamp: 1692094997754, state: "Received", progress: 0, errors: [], done_response: None }

    2023-08-15T10:23:17.754167Z  INFO uplink::base::bridge: Action response = ActionResponse { action_id: "1406", device_id: None, sequence: 1, timestamp: 1692094997754, state: "Downloading", progress: 0, errors: [], done_response: None }

    2023-08-15T10:23:18.367453Z  INFO uplink::collector::downloader: Downloading from https://firmware.stage.bytebeam.io/api/v1/firmwares/new firmware/artifact into /media/devdutt/EC6C23BE6C238286/persistence/update_firmware/new firmware

    2023-08-15T10:23:18.367744Z  INFO uplink::base::bridge: Action response = ActionResponse { action_id: "1406", device_id: None, sequence: 2, timestamp: 1692094998367, state: "Failed", progress: 100, errors: ["File io Error: No space left on device (os error 28)"], done_response: None }