feat(rust): make portal handshake optional #31719

Job	Run time
Rust - build	2m 25s
Rust - build_docs	2m 7s
Rust - check_cargo_update	2m 57s
Rust - build_examples	3m 2s
Rust - check_no_std	1m 40s
Rust - build_nightly	3m 34s
Rust - check_nightly	2m 3s
Rust - lint_cargo_readme	1m 2s
Rust - build_release	6m 54s
Rust - lint_cargo_fmt_check	55s
Rust - lint_cargo_clippy	2m 54s
Rust - ockam_command_cross_build (linux_armv7)	12m 0s
Rust - test	14m 28s
Rust - lint_cargo_deny	1m 2s
Rust - ockam_command_cross_build (macos_silicon)	10m 56s
Rust - test_nightly	15m 2s
Rust - lint_cargo_toml_files	59s
Rust - ockam_command_cross_build (linux_aarch64_gnu, ubuntu-22.04, stable, aarch64-unknown-linux-...	12m 7s
Rust - lint_cargo_machete	50s
Rust - test_ockam_command (linux_86)	9m 6s
Rust - test_postgres	6m 35s
	1h 52m 38s

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