remove comments tab from files

[sorbaugh]

Summary

This is the the second part of a two part Pull Request to move code from the comments app found in server to the activity app.

Here is the other PR: nextcloud/activity#1387

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)

[nickvergessen]

Setting pending documentation This pull request needs an associated documentation update because it's needed in case the feature is being deprecated or removed directly.

[sorbaugh]

Thanks for pointing it out! For context, the comments feature is being moved to the activity repo, so this is one of two pull requests.
nextcloud/activity#1387

Dismissing my review

[artonge]

Is this file still needed?

[artonge]

What was the use of this file?

[artonge]

Actually, most of this need to be kept as:

if activity app is disabled and comments app enabled:
show comments tab as-is

[nickvergessen]

That also means we can keep the public API working for apps using the comments UI, that's great news!

[susnux]

closing in favor of #41491
(for reuse code and not duplicate comments code to activity app)