Lab 05, Replace GUID-based suffix generation with Lab Instance ID throughout MLOps lab

The lab currently uses GUID-generated suffixes in both the provisioning scripts and lab instructions.

This causes resource names to diverge from the Azure Policy naming requirements and prevents resources from matching ACP constraints.

Update all scripts and instructions that reference GUID-based naming to use the Skillable Lab Instance ID instead.

Current:

guid=$(cat /proc/sys/kernel/random/uuid)
suffix=${guid//[-]/}
suffix=${suffix:0:18}

Proposed:

suffix=$(whoami | cut -d'-' -f2)

Updates required:

• setup-prod-design.sh
• setup-mlops-envs.sh
• setup.sh
  -setup1.sh
• Any instruction steps that reference GUID generation
• Any screenshots, examples, or expected output that contain GUID-based resource names

Expected naming convention:

rg-ai300-l
mlw-ai300-l

rg-ai300-dev-
mlw-ai300-dev-

rg-ai300-prod-
mlw-ai300-prod-

rg-ai300-reg-
mlr-ai300-shared-

This change aligns all generated resources with the ACP naming requirements and ensures deterministic resource names across lab runs.

Search setup-prod-design.sh, setup-mlops-envs.sh, setup.sh, setup1.sh, and the lab instructions for GUID-based suffix generation and resource-name examples. Replace those references with the Lab Instance ID convention, then check screenshots and expected output for remaining GUID-based names. Done means all listed resources consistently use the expected rg-ai300, mlw-ai300, and mlr-ai300 naming patterns.