Add an error log message that notifications app isn't enabled at file…

[falghamdi125]

• Resolves: Files_reminders app doesn't load, and no error is shown if the notification app is not installed. #49231

Summary

This PR adds an error log message telling admin that the notifications app is not enabled at the files_reminders app loading.

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)

[Pytal]

Nice improvement!

[joshtrichards]

@falghamdi125 Can you fix your commit message? We use Conventional Commit style messages here these days.

[joshtrichards]

/backport to stable30

[joshtrichards]

/backport to stable29

[joshtrichards]

/backport to stable28

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[falghamdi125]

@falghamdi125 Can you fix your commit message? We use Conventional Commit style messages here these days.

Done!