Resolve "Update containerlab_slim.clab.yaml for recent changes in gNMI-Target"

Description

Related Issue

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

See #302

dev_env_data/clab/gosdn_slim.clab.yaml

@@ -31,6 +31,8 @@ topology:
       image: gnmi-target
       ports:
         - 7030:7030
+      cmd: 
+        start --log debug --insecure true
       mgmt-ipv4: 172.100.0.11
       startup-delay: 5
 
@@ -39,6 +41,8 @@ topology:
       image: gnmi-target
       ports:
         - 7031:7030
+      cmd: 
+        start --log debug --insecure true
       mgmt-ipv4: 172.100.0.12
       startup-delay: 5