chore(all): use netip.Prefix for ip networks

- remove usage of `net.IPNet`
- remove usage of `netaddr.IPPrefix`

internal/configuration/settings/helpers/merge.go

@@ -187,32 +187,6 @@ func MergeUint16Slices(a, b []uint16) (result []uint16) {
 	return result
 }
 
-func MergeIPNetsSlices(a, b []net.IPNet) (result []net.IPNet) {
-	if a == nil && b == nil {
-		return nil
-	}
-
-	seen := make(map[string]struct{}, len(a)+len(b))
-	result = make([]net.IPNet, 0, len(a)+len(b))
-	for _, ipNet := range a {
-		key := ipNet.String()
-		if _, ok := seen[key]; ok {
-			continue // duplicate
-		}
-		result = append(result, ipNet)
-		seen[key] = struct{}{}
-	}
-	for _, ipNet := range b {
-		key := ipNet.String()
-		if _, ok := seen[key]; ok {
-			continue // duplicate
-		}
-		result = append(result, ipNet)
-		seen[key] = struct{}{}
-	}
-	return result
-}
-
 func MergeNetipAddressesSlices(a, b []netip.Addr) (result []netip.Addr) {
 	if a == nil && b == nil {
 		return nil