Clean up DB columns related to push_component/pop_component

[saketh-are]

After #11018 we can deprecate DBCol PeerComponent, ComponentEdges, and LastComponentNonce:

nearcore/chain/network/src/store/schema/mod.rs

Lines 104 to 123 in 5a35c02

	pub(super) struct PeerComponent;
	impl Column for PeerComponent {
	const COL: DBCol = DBCol::PeerComponent;
	type Key = Borsh<PeerId>;
	type Value = Borsh<u64>;
	}
	pub(super) struct ComponentEdges;
	impl Column for ComponentEdges {
	const COL: DBCol = DBCol::ComponentEdges;
	type Key = U64LE;
	type Value = Vec<EdgeRepr>;
	}
	pub(super) struct LastComponentNonce;
	impl Column for LastComponentNonce {
	const COL: DBCol = DBCol::LastComponentNonce;
	type Key = Borsh<()>;
	type Value = Borsh<u64>;
	}