refs #19292 [finc] simplify record icons

* move code for determination of record icon class type from template record-icon to record view helper
* combine access icon and text
** add parameter addText to method getRecordIcon to return icon with text

co-authored by: Dorian Merz <merz@ub.uni-leipzig.de>
* some refactoring of cover loading logic
** include missing records
** introduce another helper function
** adapt template
** also refs #19382_b