fix: expand select and group by for calendar reminder backend

[hamza221]

• Resolves: [Bug]: DriverException during BackgroundJob #47275

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)

[miaulalala]

apps/dav/tests/unit/CalDAV/Reminder/BackendTest.php:115 - I think you might need the id column after all but I haven't looked into it. LMK if you want to do a debugging call.

[ChristophWurst]

/backport to stable30

[solracsf]

There was 1 error:
1) OCA\DAV\Tests\unit\CalDAV\Reminder\BackendTest::testGetRemindersToProcess
Undefined array key "id"
/home/runner/actions-runner/_work/server/server/apps/dav/lib/CalDAV/Reminder/Backend.php:191
/home/runner/actions-runner/_work/server/server/apps/dav/lib/CalDAV/Reminder/Backend.php:57
/home/runner/actions-runner/_work/server/server/apps/dav/tests/unit/CalDAV/Reminder/BackendTest.php:115

[miaulalala]

This change fails for me with share notifications

[ChristophWurst]

Tested with ONLY_FULL_GROUP_BY on in mariadb. Master fails, this works

👍

[hamza221]

Tested with ONLY_FULL_GROUP_BY on in mariadb. Master fails, this works

👍

Other tests are failing now, after rebase

[solracsf]

I've previously submitted a, perhaps, less error-prone PR here (closed because this one was older) : #47996