fix(list): CIDR validator

[zry98]

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Changes being requested

#6570

Fix resource cloudflare_list CIDR validation errors like:

│ Error: IP address must be normalized
│
│   with cloudflare_list.ip_whitelist,
│   on lists.tf line 8, in resource "cloudflare_list" "ip_whitelist":
│    8:   items = [
│    9:     {
│   10:       ip = "1.1.1.0/24"
│   11:       comment = "Test IP addr"
│   12:     },
│   13:     {
│   14:       ip = "2400:cb00::/32"
│   15:       comment = "Test IP CIDR"
│   16:     },
│   17:   ]
│
│ IP address "1.1.1.0/24" must be normalized: "1.1.1.0"

│ Error: IP address must be normalized
│
│   with cloudflare_list.ip_whitelist,
│   on lists.tf line 8, in resource "cloudflare_list" "ip_whitelist":
│    8:   items = [
│    9:     {
│   10:       ip = "1.1.1.0/24"
│   11:       comment = "Test IP addr"
│   12:     },
│   13:     {
│   14:       ip = "2400:cb00::/32"
│   15:       comment = "Test IP CIDR"
│   16:     },
│   17:   ]
│
│ IP address "2400:cb00::/32" must be normalized: "2400:cb00::"

Due to the normalization validation treating CIDR as IP address.

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[dirnikk]

The latest version 5.15.0 experience the failure, however with version 5.14.0 I am able to deploy CIDRs in list object without any issues.

[zry98]

The latest version 5.15.0 experience the failure, however with version 5.14.0 I am able to deploy CIDRs in list object without any issues.

@dirnikk Exactly, it was introduced in the commit c2dcd1a

[dirnikk]

This PR is a must.

[mgirouard]

cc @psutherland-cloudflare