[watsonx-self-managed-ocp] Extend helm destroy timeout

[ocofaigh]

20mins doesn't seem enough:

 2025/07/01 13:35:25 Terraform destroy | module.watsonx_self_managed_ocp.module.cloud_pak_deployer.helm_release.cloud_pak_deployer_helm_release: Still destroying... [id=cloud-pak-deployer, 20m0s elapsed]
 2025/07/01 13:35:26 Terraform destroy | 
 2025/07/01 13:35:26 Terraform destroy | Error: 1 error occurred:
 2025/07/01 13:35:26 Terraform destroy | 	* timed out waiting for the condition
 2025/07/01 13:35:26 Terraform destroy | 
 2025/07/01 13:35:26 Terraform destroy |