Merge remote-tracking branch 'alex/memory-leak-fixes_contribute-7.6' into minor-themed-component-fixes_contribute-main

# Conflicts:
#	src/app/item-page/edit-item-page/item-bitstreams/item-edit-bitstream-bundle/item-edit-bitstream-bundle.component.ts
#	src/app/item-page/edit-item-page/item-bitstreams/item-edit-bitstream-drag-handle/item-edit-bitstream-drag-handle.component.ts
#	src/app/item-page/edit-item-page/item-bitstreams/item-edit-bitstream/item-edit-bitstream.component.ts

Author: alexandrevryghem