Adam MABROUK

fix(kv_secret_v2): prevent panic when payload omitted; enforce ExactlyOneOf for data_json/data_json_wo

2

### Description This PR fixes a provider panic in vault_kv_secret_v2 when neither data_json nor data_json_wo is set. It Adds `ExactlyOneOf` Validation covering both attributes ["data_json", "data_json_wo"] Closes #2586 ### Checklist...

### Terraform Core Version 1.12.2 ### Terraform Vault Provider Version 5.2.1 ### Vault Server Version 1.20.2 ### Affected Resource(s) * resource_kv_secret_v2 ### Expected Behavior vault_kv_secret_v2 crashes with a panic when...