feat(vdc): change datasource schema

[gaetanars]

Description of your changes

Change datasource vdc schema according to vdc ressource

If you submit change in the provider code, please make sure to:

• Write or modify examples in examples/ directory
• Write or modify acceptance tests
• Run make generate to ensure the doc was updated properly

How has this code been tested

❯ make testacc TEST=./internal/provider TESTARGS='-run TestAccVdcDataSource'
TF_ACC=1 go test ./... -v -run TestAccVdcDataSource -timeout 120m
?       github.com/orange-cloudavenue/terraform-provider-cloudavenue    [no test files]
=== RUN   TestAccVdcDataSource
--- PASS: TestAccVdcDataSource (9.79s)
PASS
ok      github.com/orange-cloudavenue/terraform-provider-cloudavenue/internal/provider  9.793s
testing: warning: no tests to run
PASS
ok      github.com/orange-cloudavenue/terraform-provider-cloudavenue/pkg/utils  (cached) [no tests to run]