Support space (and more) in tag groups

[kjac]

Prerequisites

• I have added steps to test this contribution in the description below

If there's an existing issue for this PR then this fixes #13146

Description

The linked issue takes a bit of a detour, but here's the gist: If you create a Tags property with a space in the tag group (possibly also other special chars), the Tags editor throws a JS error in the console whenever you focus the editor (click inside the textbox):

Fortunately this is fixable by replacing all non-word chars in the tags group before putting it to use.

Testing this PR

1. Create a Tags data type with a space in the tag group.
2. Create and publish some content with tags using this Tags data type (publish being the magic word here).
3. Create new content of the same type and verify that the Tags property supports type-ahead using the previously published tags.