refactor pvf security module (#3047)

resolve https://github.com/paritytech/polkadot-sdk/issues/2321

- [x] refactor `security` module into a conditionally compiled
- [x] rename `amd64` into x86-64 for consistency with conditional
compilation guards and remove reference to a particular vendor
- [x] run unit tests and zombienet

---------

Co-authored-by: s0me0ne-unkn0wn <48632512+s0me0ne-unkn0wn@users.noreply.github.com>

polkadot/node/core/pvf/common/src/lib.rs

@@ -86,3 +86,33 @@ pub fn framed_recv_blocking(r: &mut (impl Read + Unpin)) -> io::Result<Vec<u8>>
 	r.read_exact(&mut buf)?;
 	Ok(buf)
 }
+
+#[cfg(all(test, not(feature = "test-utils")))]
+mod tests {
+	use super::*;
+
+	#[test]
+	fn default_secure_status() {
+		let status = SecurityStatus::default();
+		assert!(
+			!status.secure_validator_mode,
+			"secure_validator_mode is false for default security status"
+		);
+		assert!(
+			!status.can_enable_landlock,
+			"can_enable_landlock is false for default security status"
+		);
+		assert!(
+			!status.can_enable_seccomp,
+			"can_enable_seccomp is false for default security status"
+		);
+		assert!(
+			!status.can_unshare_user_namespace_and_change_root,
+			"can_unshare_user_namespace_and_change_root is false for default security status"
+		);
+		assert!(
+			!status.can_do_secure_clone,
+			"can_do_secure_clone is false for default security status"
+		);
+	}
+}