[TASK] Add api tag to ElementBrowser::setRecordList()

This method was introduced in TYPO3 6.2 with the purpose to be used
by Extensions. Therefore the @deprecated tag is replaced with an
@api tag.

Resolves: #56742
Releases: 6.2
Change-Id: Ia48a8c6997c26318a6fea50af32cd73f1138bb2b
Reviewed-on: https://review.typo3.org/28237
Reviewed-by: Tymoteusz Motylewski
Tested-by: Tymoteusz Motylewski
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters