CM v2.0.2: improved handling of CM repositories based on user feedback

• added support to update all CM Git repos in one go: "cm pull repo"
• added support to show extra info about CM Git repos: "cm show repo"
• added explicit support for Private Access Token (PAT) when pulling private CM repos:
  cm pull repo ctuning@mlcommons-ck-reproduce-inference-v4.0 --pat={GITHUB PAT}
• added support to remove CM repositories via "cm rm repo" even if read only (required for Windows)
• added support to self-fix CM repo list if repository was manually deleted