remove workerpool related fields from vpc cluster Read

[attilatabori]

Community Note

• Please vote on this pull request by adding a 👍 reaction to the original pull request comment to help the community and maintainers prioritize this request
• Please do not leave "+1" or other comments that do not add relevant new information or questions, they generate extra noise for pull request followers and do not help prioritize the request

Relates OR Closes #0000

Output from acceptance testing:

tabori@attilas-mbp terraform-provider-ibm % make testacc TEST=./ibm/service/kubernetes TESTARGS='-run=TestAccIBMContainerVpcClusterBaseEnvvar'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./ibm/service/kubernetes -v -run=TestAccIBMContainerVpcClusterBaseEnvvar -timeout 700m
[...]
2024-04-18T12:14:58.408+0200 [DEBUG] sdk.helper_resource: Finished TestCase: test_name=TestAccIBMContainerVpcClusterBaseEnvvar
--- PASS: TestAccIBMContainerVpcClusterBaseEnvvar (1476.59s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/kubernetes      1479.291s
...

removed wp fields from read

2024-04-23T13:28:15.679+0200 [DEBUG] sdk.helper_resource: Finished TestCase: test_name=TestAccIBMContainerVpcClusterBaseEnvvar
--- PASS: TestAccIBMContainerVpcClusterBaseEnvvar (1515.22s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/kubernetes      1517.810s