[TASK] Show infobox for records which are set to readOnly

Records can be set to readOnly by setting 'readOnly` in the TCA ctrl section.
Inform editors by rendering an infobox above the record.

Additionally improve the code of the record note rendering.

Resolves: #85244
Releases: master, 8.7
Change-Id: I46c84f18b22332c5691f7fb41836a0b97f8dafa2
Reviewed-on: https://review.typo3.org/57253


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Riccardo De Contardi <erredeco@gmail.com>
Reviewed-by: Tymoteusz Motylewski <t.motylewski@gmail.com>
Tested-by: Tymoteusz Motylewski <t.motylewski@gmail.com>