Add support for HTTP/1 connection pre-warming #166

Job	Run time
Cxx interop / Construct Cxx interop matrix	6s
Unit tests / Construct unit test matrix	3s
Release builds / Construct release build matrix	6s
Soundness / Format check	41s
Soundness / Shell check	39s
Soundness / YAML lint check	6s
Soundness / Broken symlinks check	4s
Soundness / Python lint check	8s
Soundness / Documentation check	3m 6s
Soundness / Unacceptable language check	4s
Soundness / API breakage check	4m 44s
Soundness / License headers check	5s
Static SDK / Static SDK / Linux (latest-release Jammy)	3m 29s
Static SDK / Static SDK / Linux (main Jammy)	4m 57s
Unit tests / Unit tests / Linux (6.0)	5m 28s
Unit tests / Unit tests / Linux (5.10)	5m 4s
Unit tests / Unit tests / Linux (nightly-next)	6m 6s
Unit tests / Unit tests / Linux (6.1)	5m 15s
Unit tests / Unit tests / Linux (nightly-main)	6m 12s
Release builds / Release builds / Linux (6.0)	4m 58s
Release builds / Release builds / Linux (nightly-main)	5m 17s
Release builds / Release builds / Linux (6.1)	4m 0s
Release builds / Release builds / Linux (5.10)	3m 36s
Release builds / Release builds / Linux (nightly-next)	5m 21s
Cxx interop / Cxx interop / Linux (5.10)	2m 36s
Cxx interop / Cxx interop / Linux (6.0)	2m 58s
Cxx interop / Cxx interop / Linux (nightly-next)	3m 58s
Cxx interop / Cxx interop / Linux (nightly-main)	3m 57s
Cxx interop / Cxx interop / Linux (6.1)	3m 7s
	1h 26m 11s

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