Feature/import ad computers

[Tyrix]

Changes proposed in this pull request

• Added a new UI flow in the Remote Desktop host view to import computer accounts directly from an on-premises Active Directory via LDAP
• Introduced ActiveDirectoryComputerSearcher in NETworkManager.Utilities to handle secure AD queries using current Windows credentials
• Added automatic filtering to skip disabled AD accounts, accounts missing a DNS Host Name, and existing duplicate profiles in the target group
• Implemented persistent settings to remember the last successful LDAP search base (RemoteDesktop_ActiveDirectoryImportLdapSearchBase) for better UX

Related issue(s)

• Fixes Import Active Directory Computers for Remote Desktop #3367

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Summary
Adds Remote Desktop functionality to import computer accounts from an on-premises Active Directory using an LDAP subtree search from a user-supplied search base (OU DN). Imported machines are added to a single target profile group. Each profile is created with Remote Desktop enabled, utilizing the dNSHostName property.

User-visible behavior

• Adds a toolbar control (domain icon) next to "add profile" on the Remote Desktop host view.
• Provides inputs for: search base, target group (existing or new), and an option to exclude disabled accounts.
• Uses current Windows credentials for the LDAP bind.
• Stores and prefills the last successful LDAP search base.
• Displays a summary dialog reporting imported accounts, skipped duplicates, and skipped entries lacking a DNS host name.
• Calls ProfileManager.Save() after a successful import.

Implementation notes

• LDAP logic is encapsulated in NETworkManager.Utilities.ActiveDirectoryComputerSearcher using System.DirectoryServices.
• Added a null/empty guard in GroupNameValidator to prevent exceptions on editable group combos.

To-Do

• Update documentation to reflect this changes
• Update changelog to reflect this changes

Contributing

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• I have read and understood the contributing guidelines and the code of conduct.
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• The code or resource is compatible with the GNU General Public License v3.0.