External Links "Open in new tab" option doesn't apply to custom fields with 'Default text renderer'

Issue Summary

In JRASERVER-9380, we implemented the "Open in new tab" user preference for external links.
In JRASERVER-70096 we fixed URL custom fields follows the "Open in new tab" user preference.

However,  the "Open in new tab" user preference is not respected for single and multiline text custom fields when 'Default text renderer' is selected.

Steps to Reproduce

1. Create a text custom field (and do not change the default renderer).
2. Make sure a user has the "Open in new tab" user preference set in the user profile.
3. Create an issue with a link in the text.
4. Click the link. (or inspect HTML attributes of the link)

Expected Results

The link should be opened in a new tab.

Actual Results

The link opens in the same tab.

Workaround

One can change the renderer of the field to 'Wiki style renderer' that respects the "Open in new tab" user preference.