Make compatible with CKEditor 5

Problem/Motivation

The existing text filter doesn't work when CKEditor 5 is used, this error is returned when you try to enable it:

CKEditor 5 only works with HTML-based text formats. The "Parse Cincopa Tags" (filter_cincopa) filter implies this text format is not HTML anymore.

Proposed resolution

Change the filter so that it can be compatible with CKEditor 5.

Remaining tasks

Work out how to make the filter compatible.

User interface changes

n/a

API changes

TBD

Data model changes

n/a