replace netlink-* crates with procfs #24768
Description
Vector's Linux-specific TCP metrics collection (sources::host_metrics::tcp) currently depends on the netlink-packet-* crate ecosystem. Currently netlink-* updates are blocked by rust-netlink/netlink-packet-sock-diag#21. There hasn't been any meaningful activity there for a while.
We can replace all netlink crates with a single dependency, https://crates.io/crates/procfs. A mature crate used by sysinfo, heim, and other production Rust tools.