Merge from public release/6.0.1xx to internal/release/6.0.1xx and resolve conflicts if necessary

----
#### AI description  (iteration 1)
#### PR Classification
Code cleanup and dependency update.

#### PR Summary
This pull request merges changes from the public repository, focusing on script updates and dependency adjustments.
- Added `nuget-verification.ps1` to verify Microsoft NuGet packages.
- Removed `post-build-utils.ps1`, `trigger-subscriptions.ps1`, and `add-build-to-channel.ps1` scripts.
- Updated `NuGet.config` with new package sources.
- Updated dependencies in `Version.Details.xml`.
- Modified `publish-build-assets.yml` to use `AzureCLI@2` instead of `PowerShell@2`.