revert: "feat(https-outcalls): re-enable H/2 support for outcalls" #15361

Job	Run time
Bazel Build All Config Check	3m 28s
Bazel Test All	15m 59s
Bazel Build Fuzzers AFL	2m 20s
Bazel Build Fuzzers	2m 1s
Build IC	17m 26s
Bazel Test macOS Intel	0s
Bazel Test Coverage	0s
Cargo Build Release Linux	7m 15s
Cargo Clippy Linux	3m 49s
Python CI Tests	2m 12s
Build Determinism (//publish/binaries:upload, release, build-ic/release, false)	18s
Build Determinism (//publish/canisters:upload, canisters, build-ic/canisters, false)	15s
Build Determinism (//ic-os/guestos/envs/prod:upload_disk-img, guest-os/update-img, build-ic/icos/...	17s
Build Determinism (//ic-os/hostos/envs/prod:upload_update-img, host-os/update-img, build-ic/icos/...	17s
Build Determinism (//ic-os/setupos/envs/prod:upload_disk-img, setup-os/disk-img, build-ic/icos/se...	18s
	55m 55s

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