Allow only sync users from a group

[weilai-irl]

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[Copilot]

Pull request overview

This PR introduces an admin-configurable “user sync group filter” so user synchronization (and photo/timezone sync) can be restricted to members of a specific Microsoft 365 group, and enhances photo sync efficiency by hashing batch-fetched photos to avoid unnecessary updates.

Changes:

• Added an “User sync group filter” admin setting (GUID) and wiring to drive user sync batching from /groups/{id}/members.
• Updated user sync / photo+timezone sync tasks to surface group-filter info in logs and to apply group membership filtering.
• Extended photo batch API responses with a SHA-256 hash and updated photo-apply logic to skip writes when hashes match.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 9 comments.

Show a summary per file

File	Description
local/o365/settings.php	Registers the new admin setting for the group filter under user sync settings.
local/o365/lang/en/local_o365.php	Adds UI strings for the new setting (label/description/validation string).
local/o365/classes/task/usersync.php	Logs group filter status and adjusts displayed sync options list.
local/o365/classes/task/photoandtimezonesync.php	Applies group filtering to photo/timezone sync processing and uses photo hash to reduce updates/log noise.
local/o365/classes/rest/unified.php	Adds batched group member processing APIs and includes photo hashes in batch responses.
local/o365/classes/feature/usersync/main.php	Routes user batching through group-member endpoints; adds optional photo-hash compare to skip reprocessing.
local/o365/classes/adminsetting/usersyncgroupfilter.php	Implements the validated configtext setting for GUID input.

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