Move observer triggered team owner/member sync for individual users to ad-hoc tasks

[weilai-irl]

No description provided.

[Copilot]

Pull request overview

This PR refactors the Microsoft 365 group membership synchronization for individual users from synchronous observer-triggered calls to asynchronous ad-hoc tasks. The change improves performance and resilience by offloading potentially slow Microsoft Graph API calls to the task queue rather than blocking during Moodle event processing.

Changes:

• Created new usergroupmembershipsync ad-hoc task to handle individual user-course group membership synchronization
• Updated four event observers (user_enrolment_updated, enrol_instance_updated, role_assigned, role_unassigned) to queue ad-hoc tasks instead of making synchronous API calls
• Added language string for the new task name

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
local/o365/version.php	Updated plugin version number to 2025040820.02
local/o365/lang/en/local_o365.php	Added language string 'task_usergroupmembershipsync' for the new ad-hoc task
local/o365/classes/task/usergroupmembershipsync.php	New ad-hoc task class that syncs a single user's role in a course group to Microsoft 365
local/o365/classes/observers.php	Modified four event handlers to queue ad-hoc tasks instead of calling sync_user_role_in_course_group directly

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