OZG-7707 replace more icons

...iguration/src/lib/menu-container/menu/menu.component.html

...ration/src/lib/menu-container/menu/menu.component.spec.ts

...nfiguration/src/lib/menu-container/menu/menu.component.ts

...ntainer/user-list/user/user-data/user-data.component.html

...iner/user-list/user/user-data/user-data.component.spec.ts

...container/user-list/user/user-data/user-data.component.ts

...lle-container/externe-fachstelle-container.component.html

...-container/externe-fachstelle-container.component.spec.ts

...client/libs/collaboration/src/lib/collaboration.module.ts

alfa-client/libs/design-system/src/index.ts

...cons/external-unit-icon/external-unit-icon.component.html

...s/external-unit-icon/external-unit-icon.component.spec.ts

.../icons/external-unit-icon/external-unit-icon.component.ts

...ib/icons/external-unit-icon/external-unit-icon.stories.ts

...src/lib/icons/mailbox-icon/mailbox-icon.component.spec.ts

...stem/src/lib/icons/mailbox-icon/mailbox-icon.component.ts

...system/src/lib/icons/mailbox-icon/mailbox-icon.stories.ts

.../externe-fachstelle-list-item-container.component.spec.ts

...lle-list-item/externe-fachstelle-list-item.component.html

...-list-item/externe-fachstelle-list-item.component.spec.ts