Reorganise local_o365 sync settings configuration page

[weilai-irl]

No description provided.

[Copilot]

Pull request overview

Splits the combined local_o365_sync admin settings page into two separate pages — User Sync and Course Sync — and reorders Cohort sync / Course request sections so they live on the Advanced page (before Tools). Adds backward-compat redirects and tab constants so existing links/bookmarks still resolve.

Changes:

• Replace the single local_o365_sync settings page with new local_o365_usersync and local_o365_coursesync pages, and move Cohort sync + Course request settings onto the Advanced page above Tools.
• Add a legacy redirect from section=local_o365_sync to local_o365_usersync, two new tab constants (LOCAL_O365_TAB_USERSYNC, LOCAL_O365_TAB_COURSESYNC), and map the old LOCAL_O365_TAB_SYNC value to the new User Sync page.
• Update local_o365_get_settings_nav_html() and add the corresponding settings_header_usersync / settings_header_coursesync language strings.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
local/o365/settings.php	Splits sync settings into two pages, relocates Cohort/Course-request sections to Advanced, and adds back-compat redirect for the old section URL.
local/o365/lib.php	Adds two new tab constants and updates the settings nav helper to list User Sync and Course Sync as separate tabs.
local/o365/lang/en/local_o365.php	Adds settings_header_usersync and settings_header_coursesync strings for the new tabs.

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