Fix 'conda command not found' in AzureML example Creation scripts

[lucasfijen]

Description

This PR fixes an issue with 'conda command not found' in recent azureml compute instance setup scripts.

The underlying reason why we run in this error is probably that before the creation scripts are ran, conda is installed, but bashrc is not ran, nor is bash restarted. This PR adds manually the PATH to conda to the scripts by running source /anaconda/etc/profile.d/conda.sh before the initial conda commands.

As this script is referenced in the documentation, this change will also update the documentation on creation scripts on azureml Compute instances. https://github.com/MicrosoftDocs/azure-docs/blob/main/articles/machine-learning/how-to-customize-compute-instance.md
Currently following the steps on the documentation gives you the above mentioned error.

Fixes #3291

Checklist

• I have read the contribution guidelines.
  • General
  • SDK
  • CLI
• I have coordinated with the docs team (mldocs@microsoft.com) if this PR deletes files or changes any file names or file extensions.
• Pull request includes test coverage for the included changes.
• This notebook or file is added to the CODEOWNERS file, pointing to the author or the author's team.

[lucasfijen]

Hi @seanyao1 thanks for the approval, do i need to do anything further to get it merged? I see the automerge is not being completed due to 2 required checks that are hanging on Expected — Waiting for status to be reported. How can we get these passed?