[TASK] Avoid long varchar() in pages table

Prefer TEXT over VARCHAR(2048) for pages:canonical_link.
This gives more "room" for other bigger fields in this
table. It is possible since #103578 allows to handle
DEFAULT with TEXT.

Resolves: #104138
Related: #104063
Related: #101553
Related: #104068
Related: #103578
Releases: main
Change-Id: I1bd82ce016565d83fe654331b83c930f0da49cfc
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/84748


Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>