[TASK] Migrate new record controller to Fluid-based rendering

This change cleans up the NewRecordController which hasn't been
touched since ages. It cleans up the render-related functionality
into a Fluid Template.

Within Fluid, Bootstrap 5 styling is now applied properly.

Resolves: #95332
Releases: master
Change-Id: Ic6a2e8967cfe8ee7ee0876300244e8bce9ca5c57
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/71216

Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>

typo3/sysext/backend/Resources/Private/Templates/NewRecord.html

+<h1><f:translate key="LLL:EXT:core/Resources/Private/Language/locallang_core.xlf:db_new.php.pagetitle" /></h1>
+<f:for each="{groupedLinksOnTop}" key="recordTypeTable" as="groupedLinks">
+    <div class="row mb-4">
+        <div class="col-12">
+            <strong><core:icon identifier="{groupedLinks.icon}" size="small" /> {groupedLinks.title}</strong>
+            <div class="list-group mt-2">
+                <f:for each="{groupedLinks.items}" as="link">
+                    {link -> f:format.raw()}
+                </f:for>
+            </div>
+        </div>
+    </div>
+</f:for>
+<f:for each="{recordTypeGroups}" as="recordTypeGroup">
+    <div class="row mb-4">
+        <div class="col-12">
+            <strong>{recordTypeGroup.icon -> f:format.raw()} <f:format.case mode="capital">{recordTypeGroup.title}</f:format.case></strong>
+            <div class="list-group mt-2">
+                <f:for each="{recordTypeGroup.html}" key="recordTypeTable" as="recordTypeItem">
+                    {recordTypeItem -> f:format.raw()}
+                </f:for>
+            </div>
+        </div>
+    </div>
+</f:for>
+<f:if condition="{pagePositionMapForPagesOnly}">
+    <h3><f:translate key="LLL:EXT:core/Resources/Private/Language/locallang_misc.xlf:selectPosition" /></h3>
+    {pagePositionMapForPagesOnly -> f:format.raw()}
+</f:if>