Code maintenance OP-19344: Remove CKEditor preview mode

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Preview ###

### Steps to reproduce

1. Login and open/create a new wiki page

2. Enter some content

3. Click on Toggle preview mode got broken with 48.0

4. Click again

### What is the buggy behavior?

* The entered content disappears and since mentions are now embedded, there ~~only the half of the toolbar~~ is little use active

### What is the expected behavior?

1. The content should not disappear and the whole toolbar should be visible

###

### Environment information

**OpenProject version**

**Core build**

[8fbef353ce8bfe6e429646334464e8d5c577f906](https://qa.openproject-edge.com/external_redirect?url=https%3A%2F%2Fgithub.com%2Fopf%2Fopenproject%2Fcommit%2F8fbef353ce8bfe6e429646334464e8d5c577f906)

**Product version**

[37fd84bc4f69c397aec2ea16968bf83c9031127b](https://qa.openproject-edge.com/external_redirect?url=https%3A%2F%2Fgithub.com%2Fopf%2Fsaas-openproject%2Fcommit%2F37fd84bc4f69c397aec2ea16968bf83c9031127b)

**Core version**

OpenProject 17.5.0

**Browser**

* [x] Chrome
* [ ] Firefox
* [ ] Safari
* [ ] Mobile Safari
* [ ] Other (please specify)

**Operating System**

* [ ] Windows
* [ ] Mac OS X
* [ ] Mobile iOS
* [ ] Mobile Android
* [x] Linux (please specify distro)
* [ ] Chrome OS
* [ ] Other (please specify)

**Language**

_Please specify the browser language and the language of the OpenProject user for ~~which~~ the preview mode. We have decided to remove it. ~~bug occurred._~~

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