Manifest diff as a PR comment for AzDO

[samiyaakhtar]

• Added a helper function to the AzDO script to generate manifests and post a diff as a comment - see here for an example
• Fixed a minor bug where downloading fabrikate would get into infinite loop when there's another downloaded archive from a previous job with the same name. Using a random uuid fixes this issue
• Adding -q to silence the wget output which was taking up 90% of the output in logs, making it difficult to focus on the important logs generated by the scripts

Related to microsoft/spektate#155

[samiyaakhtar]

@nmiodice I'm unable to request a review from you for some reason, but feel free to give any feedback here, I followed your template for Gitlab :)

[nmiodice]

@nmiodice I'm unable to request a review from you for some reason, but feel free to give any feedback here, I followed your template for Gitlab :)

Hey! I'm not a maintainer for this project so I won't be able to give a formal review on this. Looks like you got some feedback from the maintaining team, though. Happy to help if I can!

[andrebriggs]

It would be good too see a larger diff so we can see what the user experience is like for large yaml diffs and (additions/subtraction)

[samiyaakhtar]

Based on discussion with @andrebriggs, converting this to a draft and after testing with larger diffs, we will re-open this