[SECURITY] XSS in form creation wizard

The form name is rendered multiple times in the form wizard when either
creating or cloning a form. Any input is now sanitized to avoid XSS
in the summary step of the form wizard.

Resolves: #93560
Releases: master, 11.1, 10.4
Change-Id: I3ddce48e38e32456318c695774bbcd035115b5ae
Security-Bulletin: TYPO3-CORE-SA-2021-004
Security-References: CVE-2021-21358
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/68437


Tested-by: Oliver Hader <oliver.hader@typo3.org>
Reviewed-by: Oliver Hader <oliver.hader@typo3.org>