MacOS: Remove deprecated OneDrive "Open at login" setting; add script-based replacement

[royklo]

Summary

The OneDrive OpenAtLogin managed preference is deprecated and has been a no-op since sync app 24.113, so the "Open at login" setting in MacOS - OIB - Microsoft OneDrive - U - Known Folder Move (added in the v1.0 release) has been silently doing nothing. A Managed Login Items payload can't replace it either: per Apple, Managed Login Items only allow/lock a login item, they never enable one. The only supported mechanism is OneDrive's own /createloginitem fire-and-exit command (OneDrive 26.027+), which must run as the signed-in user.

The same issue I recently fixed in microsoft/intune-my-macs (microsoft/intune-my-macs#39); this PR ports that fix to the OIB.

Changes

MacOS - OIB - Microsoft OneDrive - U - Known Folder Move → bumped to v1.1

• Removed the deprecated "Open at login" setting from both the IntuneManagement and NativeImport exports
• Setting IDs renumbered to stay contiguous, settingCount 15 → 14
• File encodings preserved (UTF-16 LE for the IntuneManagement export, UTF-8 BOM/CRLF for NativeImport)

New MACOS/Scripts folder (mirroring WINDOWS/Scripts, first macOS script in the repo)

• Enable-OneDriveOpenAtLogin.zsh: user-context script that enables the OneDrive login item via /createloginitem. Guarded and idempotent: no-ops until OneDrive ≥ 26.027 is installed, performs the enable exactly once, then a per-user marker keeps every later run a no-op so the 15-minute cadence never re-launches OneDrive. Adapted from the MIT-licensed script in the intune-my-macs PR above (attribution in the header).
• README.md documenting purpose and deployment settings (suggested policy name MacOS - OIB - Microsoft OneDrive - U - Open at Login - v1.1, assign to users, run as signed-in user, hide notifications, every 15 minutes, 3 retries)
• Works together with the Managed Login Items in MacOS - OIB - Microsoft OneDrive - D - Service and Access: the script enables the login item, the policy keeps it allowed and locked on

Documentation

• MACOS/CHANGELOG.md: new v1.1 section documenting the removal and the new script
• MACOS/SETTINGSOUTPUT.md: removed the "Open at login" row and updated the policy name references to v1.1

Validation

• Both policy JSONs still parse, setting IDs are contiguous and 0-based
• ./Scripts/Update-OIBManifest.ps1 -Mode Validate -Platform All passes locally
• Script behaviour verified upstream in Add SCR-APP-108 OneDrive Open at Login; remove deprecated OpenAtLogin from POL-APP-100 microsoft/intune-my-macs#39 (flips the OneDriveLauncher BTM item from disabled → enabled/allowed and persists across reboots)