refactor(scripts): align test script with DEV.md authentication flow (#134)

Use MaaS API token endpoint and model discovery to match documented
developer workflow, making tests consistent with production usage and
self-adapting to deployed models.

Signed-off-by: Bartosz Majsak <bartosz.majsak@gmail.com>

Author: bartoszmajsak

maas-api/DEV.md

@@ -118,6 +118,9 @@ kubectl -n $NS patch limitador limitador --type merge \
 
 ### Testing
 
+> [!IMPORTANT] 
+> You can also use automated script `scripts/verify-models-and-limits.sh` 
+
 #### Deploying the demo model
 
 ```shell