add critical as a pending cluster state

[z0za]

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Closes #4214

Output from acceptance testing:

% make testacc TEST=./ibm/service/kubernetes TESTARGS='-run=TestAccIBMContainerVpcClusterEnvvar'
...
=== RUN   TestAccIBMContainerVpcClusterEnvvar
--- PASS: TestAccIBMContainerVpcClusterEnvvar (1493.94s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/kubernetes      1495.348s

% make testacc TEST=./ibm/service/kubernetes TESTARGS='-run=TestAccIBMContainer_ClusterConfigDataSourceVpcBasic'
...
=== RUN   TestAccIBMContainer_ClusterConfigDataSourceVpcBasic
--- PASS: TestAccIBMContainer_ClusterConfigDataSourceVpcBasic (1787.98s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/kubernetes      1789.338s

...

[ocofaigh]

It seems this did not fully fix the issue. See #4266