Add decommission compression+encryption enabled tests (#15322)

update compression environment variables to follow
the expected sub-system style, however support fallback
mode.

docs/kms/README.md

@@ -123,13 +123,14 @@ Encrypted :
 ## Encrypted Private Key
 
 MinIO supports encrypted KES client private keys. Therefore, you can use
-an password-protected private keys for `MINIO_KMS_KES_KEY_FILE`. 
+an password-protected private keys for `MINIO_KMS_KES_KEY_FILE`.
 
 When using password-protected private keys for accessing KES you need to
 provide the password via:
+
 ```
 export MINIO_KMS_KES_KEY_PASSWORD=<your-password>
-``` 
+```
 
 Note that MinIO only supports encrypted private keys - not encrypted certificates.
 Certificates are no secrets and sent in plaintext as part of the TLS handshake.