fix(vpc):better rendering of subnet in private network

[jremy42]

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Relates OR Closes #0000

Release note for CHANGELOG:

close #3322

[remyleone]

$ go run ./cmd/scw vpc private-network list
---------------------------------------------------------------------------------------
An error occurred, we are sorry, please consider opening a ticket on github using: 'scw feedback bug'
Give us as many details as possible so we can reproduce the error and fix it.
---------------------------------------------------------------------------------------
runtime error: invalid memory address or nil pointer dereference
stacktrace from panic: 
goroutine 1 [running]:
runtime/debug.Stack()
        /opt/homebrew/opt/go/libexec/src/runtime/debug/stack.go:24 +0x64
main.cleanup(0x14000237340)
        /Users/rleone/workspace/scaleway-cli/cmd/scw/main.go:42 +0xb4
panic({0x1018ccfe0?, 0x1026b63f0?})
        /opt/homebrew/opt/go/libexec/src/runtime/panic.go:914 +0x218
github.com/scaleway/scaleway-cli/v2/internal/namespaces/vpc/v2.privateNetworkSubnetMarshalerFunc({0x10181e000?, 0x14000633140?}, 0x0)
        /Users/rleone/workspace/scaleway-cli/internal/namespaces/vpc/v2/custom_private_network.go:24 +0x1cc
github.com/scaleway/scaleway-cli/v2/internal/human.marshalInlineSlice({0x10181e000, 0x14000633140, 0x97})
        /Users/rleone/workspace/scaleway-cli/internal/human/marshal.go:359 +0x250
github.com/scaleway/scaleway-cli/v2/internal/human.marshalSlice({0x10181e240?, 0x140006330c8?, 0x1018e98e0?}, 0x14000102e10)
        /Users/rleone/workspace/scaleway-cli/internal/human/marshal.go:326 +0x6d0
github.com/scaleway/scaleway-cli/v2/internal/human.Marshal({0x10181e240, 0x140006330c8}, 0x140006330c8?)
        /Users/rleone/workspace/scaleway-cli/internal/human/marshal.go:81 +0x2fc
github.com/scaleway/scaleway-cli/v2/internal/core.(*Printer).printHuman(0x14000100d20, {0x10181e240, 0x140006330c8}, 0x0)
        /Users/rleone/workspace/scaleway-cli/internal/core/printer.go:202 +0x15c
github.com/scaleway/scaleway-cli/v2/internal/core.(*Printer).Print(0x14000100d20, {0x10181e240?, 0x140006330c8?}, 0x10149e50a?)
        /Users/rleone/workspace/scaleway-cli/internal/core/printer.go:159 +0x12c
github.com/scaleway/scaleway-cli/v2/internal/core.Bootstrap(0x14000713e70)
        /Users/rleone/workspace/scaleway-cli/internal/core/bootstrap.go:281 +0x11c4
main.main()
        /Users/rleone/workspace/scaleway-cli/cmd/scw/main.go:74 +0x314

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 52.27273% with 21 lines in your changes are missing coverage. Please review.

Project coverage is 75.85%. Comparing base (b5b5efb) to head (60a9b70). Report is 4 commits behind head on master.

Files	Patch %	Lines
internal/namespaces/instance/v1/custom_server.go	25.00%	17 Missing and 1 partial :warning:
...ternal/namespaces/vpc/v2/custom_private_network.go	84.21%	2 Missing and 1 partial :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3600      +/-   ##
==========================================
- Coverage   75.95%   75.85%   -0.10%     
==========================================
  Files         194      194              
  Lines       43206    43212       +6     
==========================================
- Hits        32817    32780      -37     
- Misses       9187     9228      +41     
- Partials     1202     1204       +2     

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

[Codelax]

scw vpc private-network list does not crash anymore but the rendering is still off:

❯ scw vpc pn list -owide
ID                                    NAME             ORGANIZATION ID                       PROJECT ID                            REGION  TAGS                                             CREATED AT   UPDATED AT   SUBNETS  VPC ID  DHCP ENABLED
eafcee16-4658-4690-84d6-ad2d8d576cc4  pn-happy-turing  ee7bd9e1-9cbd-4724-b2f4-19e50f3cf38b  ee7bd9e1-9cbd-4724-b2f4-19e50f3cf38b  fr-par  [created-along-with-k8s-cluster created-by-cli]  3 weeks ago  3 weeks ago  ID                                    Subnet                    Created at   Updated at
6ed2866b-5224-4e98-a22f-12154b9726fd  172.16.16.0/22            3 weeks ago  3 weeks ago
e31b3ba1-6bfb-4245-b1ca-fcf5fd738e55  fd4a:c18e:554d:bc85::/64  3 weeks ago  3 weeks ago  53e50f63-f6c0-44f7-8576-d6edcb965d9c  true
23e11465-6939-4c30-a14e-761beac5740b                                                      pn-thirsty-diffie                     ee7bd9e1-9cbd-4724-b2f4-19e50f3cf38b  ee7bd9e1-9cbd-4724-b2f4-19e50f3cf38b  fr-par  [created-along-with-k8s-cluster created-by-cli]  1 week ago  1 week ago  ID                                    Subnet                    Created at  Updated at
56a8174c-a7c7-494e-bb87-341dd173a056  172.16.8.0/22             1 week ago  1 week ago
c8fdb28f-63a8-44bf-b59d-52b89c7c3a9e  fd4a:c18e:554d:208a::/64  1 week ago  1 week ago  53e50f63-f6c0-44f7-8576-d6edcb965d9c  true

[jremy42]

fix !