[HttpClient][Mailer] Revert "Let curl handle transfer encoding", use HTTP/1.1 for Mailgun #57569
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This PR reverts #54517 and fixes #54491 by forcing HTTP/1.1 when talking to Mailgun
The issue that #54517 tries to fix shouldn't happen since curl 7.51, which dates back from 2016 (curl/curl@d4c5a91). If you experience it, try upgrading.
The previous code worked fine for years but the new one generated reports a few weeks after its release so I'd feel more confident reverting.