Merge branch 'fix-admin-plain-scripts-need-expui-util' into repin-expui-1.0.0.15

Updated: se7enxweb/expui 1.0.0.15, the release whose modules run without jQuery

The admin's plain JavaScript scripts call Exp.util, Exp.dialog.create(),
Exp.upload.create() and Exp.datatable.create(), which expui provides from
1.0.0.15 on.

Merge remote-tracking branch 'origin/main' into sq688doc-help-land

Added: A design test that the admin scripts on plain JavaScript get their Exponential UI packs and members

The relation upload and search, the sub items table and queued publishing call Exp.util, Exp.dialog.create,
Exp.upload.create and Exp.datatable.create. The test checks, for admin, admin4 and admin4l, that every page
requesting one of these scripts also gets the exp:: packs it needs (its own ezscript_require or
BackendJavaScriptList), and that the installed Exponential UI defines each member. With expui 1.0.0.14 the packs
load but Exp.util is missing, and each script stops with "Exponential UI (...) is not on the page".

Updated: The 7x SQLI Import help covers release 2.0 with worked examples and screenshots

The help pages of 7x SQLI Import in English and German describe the six-step editor, the catalogue, a first CSV import end to end, dry runs, live progress, retry, undo, the conflict rules, notifications, schedules, the webhook / API trigger and statistics, each with a real example and screenshots, and link into the extension's own manual for the details.
The import and export guide, the data tables pages and the import-related pages of the audiences point to the new pages.

Updated: The uploader test checks that a browse link is called with the handler data, however the script names the place it fills

Fixed: The converted admin scripts write answers as text and the tests keep them free of jQuery

Review of the merged pull requests #301, #303, #305, #306 and #307:

- The dashboard's community activity block built the forum posts of another
  site as markup and kept loading for ever when the feed failed. It now
  writes the title, author and date as text, links only http and https
  addresses (with the campaign parameters set on the address), and shows
  "The latest forum posts could not be loaded." on a failed request, a
  timeout or an answer that is not the feed.
- Queued publishing showed the server's error text as markup; it is text now.
- The relation search (admin and admin4) used the box id of the answer
  unescaped in a selector and threw on an answer without content; the id is
  escaped and such an answer is reported as a failure.
- admin4's relation search template asks for what its script runs on
  (exp::core::shared, exp::io) instead of jQuery; the relation upload
  templates no longer say the dialog runs on jQuery.

The no-jQuery test covers the sub items page script and the two relation
upload page scripts, and every other script converted here: no jQuery, no
eval or string timers, no inline handlers, and the scripts on a4Dom check for
it. It also checks the head loads a4_dom.js in both lists, the queued
publishing and relation search templates require no jQuery, the Online
Editor asks for jQuery only for TinyMCE 3, and answers go in as text.

The changelog of 6.0.15 has the section of these merges.