Switch CI to use new AzureML agentless execution task

[dtzar]

• Triggers pipeline in new stage utilizing the Azure ML Agentless task
• Separate train, evaluate, and registration pipeline steps
• Option to validate if training run was registered in pipeline
• Refactored/updated register & evaluation scripts
  • Utilize functions, remove all legacy json-based code
  • Ability to do local dev & remote compute
• Switch to utilize tags versus run properties
• Consistent tagging of BuildID from AzDO runs, helpful for Improve artifact end-to-end traceability #72
• Switch build status badge to aidemos AzDO

PR #90 and this PR plus comments made on the below issues should resolve problems. If not, please file a new issue after trying to use these latest bits or comment on the below issues again.
closes #102
closes #100
closes #98
closes #92
closes #89
closes #85
closes #78