Suppresses net/http AbortHandler panic as per Go instructions

[ianseyer]

Fixes #18087, #15751, #10813, #12011, #16556, #20148

As per golang/go#28239, it is the expectation that middleware using net/http is responsible for handling http.AbortHandler errors that are automatically recovered.

In the current situation, any network connectivity blip, despite recovering successfully, results in a panic being written to the logs.

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