Added support for mlc show repos

[sujik18]

✅ PR Checklist

• Target branch is dev

📌 Note: PRs must be raised against dev. Do not commit directly to main.

✅ Testing & CI

• Have tested the changes in my local environment, else have properly conveyed in the PR description
• The change includes a GitHub Action to test the script(if it is possible to be added).
• No existing GitHub Actions are failing because of this change.

📚 Documentation

• README or help docs are updated for new features or changes.
• CLI help messages are meaningful and complete.

📁 File Hygiene & Output Handling

• No unintended files (e.g., logs, cache, temp files, pycache, output folders) are committed.

🛡️ Safety & Security

• No secrets or credentials are committed.
• Paths, shell commands, and environment handling are safe and portable.

🙌 Contribution Hygiene

• PR title and description are concise and clearly state the purpose of the change.
• Related issues (if any) are properly referenced using Fixes # or Closes #.
• All reviewer feedback has been addressed.

Fix for #188 .

Logs:

(mlcflow) sujith@ideapad-g3:~$ mlc show repo
[2025-11-08 18:37:07,917 repo_action.py:467 INFO] - Listing all repositories.

Repositories:
-------------
- Alias: local
  Path:  /home/sujith/MLC/repos/local

- Alias: llm-gate-exam-evaluation
  Path:  /home/sujith/MLC/repos/llm-gate-exam-evaluation

- Alias: mlcommons@mlperf-automations
  Path:  /home/sujith/MLC/repos/mlcommons@mlperf-automations

-------------
[2025-11-08 18:37:07,918 repo_action.py:474 INFO] - Repository listing ended
(mlcflow) sujith@ideapad-g3:~$ mlc show repos
[2025-11-08 18:37:24,427 repo_action.py:467 INFO] - Listing all repositories.

Repositories:
-------------
- Alias: local
  Path:  /home/sujith/MLC/repos/local

- Alias: llm-gate-exam-evaluation
  Path:  /home/sujith/MLC/repos/llm-gate-exam-evaluation

- Alias: mlcommons@mlperf-automations
  Path:  /home/sujith/MLC/repos/mlcommons@mlperf-automations

-------------
[2025-11-08 18:37:24,427 repo_action.py:474 INFO] - Repository listing ended
(mlcflow) sujith@ideapad-g3:~$ 

[github-actions]

MLCommons CLA bot All contributors have signed the MLCommons CLA ✍️ ✅

[arjunsuresh]

Thank you @sujik18 Fixes
#188