Add installBehavior.disableLicenseDisclaimer setting

[Alberto (a-lberto)]

📖 Description

Adds installBehavior.disableLicenseDisclaimer (boolean, default false).
When true, ShowInstallationDisclaimer skips the two license lines (InstallationDisclaimer{1,2}).

It follows the existing installBehavior.disableInstallNotes setting: enum entry, setting mapping, pass-through validator, schema property and a section in Settings.md.

• Default behavior is unchanged.
• Setting only; no command-line argument.
• The Microsoft Store notice (InstallationDisclaimerMSStore) is a different message and is still shown.
• The winget configure disclaimer is unrelated and untouched.

🔗 References

Resolves #6598

Related: #288, #3891, #6419

🔍 Validation

Tests added:

• SettingsDisableLicenseDisclaimer in AppInstallerCLITests/UserSettings.cpp (default and enabled)
• InstallFlow_LicenseDisclaimer in AppInstallerCLITests/InstallFlow.cpp, run with the setting both
  off and on: the install succeeds either way and the disclaimer is shown only when the setting is off

Ran

AppInstallerCLITests.exe "*LicenseDisclaimer"
All tests passed (9 assertions in 2 test cases)

InstallFlow_LicenseDisclaimer runs with the setting both off and on.

Used Claude chat for exploration of solution.

✅ Checklist

• Signed the [Contributor License Agreement](https://cla.opensource.microsoft.com)
• Linked to an issue
• Updated Release Notes (if applicable)
• Updated documentation (if applicable) — doc/Settings.md and the settings JSON schema
• Added or updated tests (or noted why not applicable)
• Updated Copilot instructions (not applicable: no build/architecture/convention change)

🤖 AI Assistance

• AI assistance was used and has been disclosed in this PR
• No AI assistance was used

📋 Issue Type

• Bug fix
• Feature
• Task

Microsoft Reviewers: Open in CodeFlow

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[Alberto (a-lberto)]

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