Change WIN_APP_DEV_CLI product ID from 78 to 8

[Copilot]

Updates the privacy product identifier for telemetry tagging from 78 to 8.

Changes

• Modified PrivacyProduct.WIN_APP_DEV_CLI constant in src/winapp-CLI/WinApp.Cli/Telemetry/Events/EventBase.cs

The constant is used throughout the telemetry system to tag events with PartA_PrivacyProduct:

public class PrivacyProduct
{
    public static readonly UInt16 WIN_APP_DEV_CLI = 8;  // was 78
}

Original prompt

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This section details on the original issue you should resolve

<issue_title>Change product ID to 8</issue_title>
<issue_description>Change WIN_APP_DEV_CLI from 78 to 8</issue_description>

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

• Fixes Change product ID to 8 #139

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