The darc get-channels command now groups channels by category in the text output, matching the organization used in the BarViz navigation menu. This provides better structure and readability when viewing channels in the CLI.

Additionally, the duplicate categorization logic between Darc and BarViz has been consolidated into a shared ChannelCategorizer class in the Microsoft.DotNet.ProductConstructionService.Client.Helpers namespace, eliminating code duplication and ensuring both tools use identical categorization logic.

Changes Made

• Added ChannelCategorizer utility class in the shared Client project that implements the categorization logic
• Modified WriteYamlChannelList() to group channels by category instead of simple alphabetical listing
• Updated NavMenu.razor to use the shared ChannelCategorizer instead of its own duplicate logic (~50 lines of code removed)
• Preserved JSON output format - only text output is affected by the grouping
• Added comprehensive test suite with 6 test cases covering various scenarios
• Fixed static state bug that was causing channel accumulation across multiple categorization calls

Example Output

Before:

(1)    .NET 8
(3)    Test Channel
(2)    VS Main

After:

.NET 8:
  (1)    .NET 8

VS:
  (2)    VS Main

Test:
  (3)    Test Channel

Categorization Logic

Channels are organized into predefined categories in priority order:

• .NET 20, .NET 19, ... .NET 6, .NET (for .NET releases)
• VS (for Visual Studio channels)
• Windows (for Windows-related channels)
• Test (for channels with classification="test")
• Other (for channels that don't match other categories)

Categories with no channels are automatically excluded from the output. The categorization uses case-insensitive prefix matching, ensuring channels like ".NET 8 Preview" are correctly grouped under ".NET 8".

Fixes #5196.

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