{AKS} Update addon preparation - part 3

[FumingZhang]

Description

• Not long ago, in aks-preview @tilnl-ms helped sorted out the internal operations required by some addons (PR #3911), and we are gradually synchronizing this part.
• This would also fix a bug in the preparation process of monitoring addon.
• This third PR focuses on replacing old implementations (in custom.py) and adjusting tests accordingly.
  • Replace the role assignment helper functions for monitoring, ingress-appgw, virtual node addons.
  • Replace log workspace and container insights preparation functions for the monitoring addon.
  • Adjust unit tests for latest profile, hybrid_2020_09_01 profile and decorator pattern.
  • Sync the latest change -> PR #4128

Testing Guide

History Notes

[Component Name 1] BREAKING CHANGE: az command a: Make some customer-facing breaking change.
[Component Name 2] az command b: Add some customer-facing feature.

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[yonzhan]

AKS

[FumingZhang]

Live test results -> result 1 & result 2 (retry of previously failed cases).