Suppress advertising manifest messages unless verbosity is diagnostic

[Copilot]

Advertising manifest update messages were shown during dotnet workload install regardless of verbosity level, cluttering normal command output with messages like "Advertising manifest not updated. Manifest package for {0} doesn't exist."

Changes

• Added IsDiagnostic() extension method to VerbosityOptions that returns true only for diagnostic/diag verbosity (more restrictive than existing IsDetailedOrDiagnostic())

• Guarded error messages in WorkloadManifestUpdater with _displayManifestUpdates flag:

  • FailedAdManifestUpdate
  • AdManifestPackageDoesNotExist

• Updated command constructors to pass displayManifestUpdates: Verbosity.IsDiagnostic():

  • WorkloadInstallCommand (changed from IsDetailedOrDiagnostic())
  • WorkloadUpdateCommand
  • WorkloadListCommand

• Updated tests to reflect new behavior (messages only shown at diagnostic verbosity)

Behavior

Before: Messages shown at normal, minimal, detailed, diagnostic
After: Messages shown only at diagnostic

// WorkloadInstallCommand.cs
_workloadManifestUpdater = new WorkloadManifestUpdater(
    resolvedReporter, _workloadResolver, PackageDownloader, _userProfileDir,
    _workloadInstaller.GetWorkloadInstallationRecordRepository(), 
    _workloadInstaller, _packageSourceLocation, 
    displayManifestUpdates: Verbosity.IsDiagnostic());  // Changed from IsDetailedOrDiagnostic()

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Advertising manifest messages showing up during install</issue_title>
<issue_description>```
C:\test>dotnet workload install maui ios maccatalyst android --source https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet6/nuget/v3/index.json --source https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-eng/nuget/v3/index.json --source https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-public/nuget/v3/index.json --source https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet7/nuget/v3/index.json --source https://api.nuget.org/v3/index.json

Advertising manifest not updated. Manifest package for microsoft.net.sdk.maui doesn't exist.
Advertising manifest not updated. Manifest package for microsoft.net.workload.emscripten doesn't exist.
Advertising manifest not updated. Manifest package for microsoft.net.sdk.android doesn't exist.
Advertising manifest not updated. Manifest package for microsoft.net.workload.mono.toolchain doesn't exist.

We shouldn't be showing these messages at all. Also during testing admin installs, it looks like we're looking in the wrong place for the advertising manifests (according to Jacques):

C:\test>dotnet workload install maui ios maccatalyst android --from-rollback-file https://maui.blob.core.windows.net/metadata/rollbacks/6.0.4xx-sr3.json --source https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet6/nuget/v3/index.json --source https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-eng/nuget/v3/index.json --source https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-public/nuget/v3/index.json --source https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet7/nuget/v3/index.json --source https://api.nuget.org/v3/index.json

Workload(s) 'android ios maccatalyst maui' are already installed.
Skipping NuGet package signature verification.
Failed to update the advertising manifest microsoft.net.sdk.tvos: Failed to extract information from MSI: C:\Users\WDAGUtilityAccount\AppData\Local\Temp\d79c40da-6861-471c-9a26-6de5975949a0\data\Microsoft.NET.Sdk.tvOS.Manifest-6.0.400.15.4.440-x64.msi.
Failed to update the advertising manifest microsoft.net.sdk.macos: Failed to extract information from MSI: C:\Users\WDAGUtilityAccount\AppData\Local\Temp\c5339238-80b9-4907-b3a2-a49cca958a57\data\Microsoft.NET.Sdk.macOS.Manifest-6.0.400.12.3.440-x64.msi.
Failed to update the advertising manifest microsoft.net.sdk.maccatalyst: Failed to extract information from MSI: C:\Users\WDAGUtilityAccount\AppData\Local\Temp\cabd7fce-12a7-411a-ade1-ccf6e05d301d\data\Microsoft.NET.Sdk.MacCatalyst.Manifest-6.0.400.15.4.440-x64.msi.
Failed to update the advertising manifest microsoft.net.workload.mono.toolchain: Failed to extract information from MSI: C:\Users\WDAGUtilityAccount\AppData\Local\Temp\4d113a51-82c4-4772-b944-73723615af0e\data\Microsoft.NET.Workload.Mono.ToolChain.Manifest-6.0.300.6.0.7-x64.msi.
Failed to update the advertising manifest microsoft.net.sdk.android: Failed to extract information from MSI: C:\Users\WDAGUtilityAccount\AppData\Local\Temp\943cb9c7-d6d6-4648-9589-f82993800dca\data\Microsoft.NET.Sdk.Android.Manifest-6.0.300.32.0.442-x64.msi.

<agent_instructions>We should suppress the advertising manifest messages during install unless verbosity is set to diag.</agent_instructions>

## Comments on the Issue (you are @copilot in this section)

<comments>
</comments>

• Fixes Advertising manifest messages showing up during install #26626

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