[BUGFIX] Fix misleading hint in Mvc/Dispatcher

The new property mapper is enabled by default now.
Due to this the hint inside the exception is misleading.
It hints now to the new @ignorevalidation annotation.

The old one annotation will stay.

Change-Id: I6a7f213f38a72a3b7676af5b1bf07f879fb99253
Resolves: #52198
Releases: 6.2
Reviewed-on: https://review.typo3.org/23999
Reviewed-by: Georg Ringer
Tested-by: Georg Ringer