OZG-7707 move aria-hidden from icons to component

alfa-client/apps/admin/src/app/app.component.html

alfa-client/apps/demo/src/app/app.component.html

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

...-container/organisations-einheit-container.component.html

alfa-client/libs/design-system/src/assets/accessibility.svg

alfa-client/libs/design-system/src/assets/account-circle.svg

alfa-client/libs/design-system/src/assets/admin-logo.svg

alfa-client/libs/design-system/src/assets/archive.svg

alfa-client/libs/design-system/src/assets/arrow-back.svg

alfa-client/libs/design-system/src/assets/attachment.svg

...lient/libs/design-system/src/assets/bescheid-generate.svg

...-client/libs/design-system/src/assets/bescheid-upload.svg

alfa-client/libs/design-system/src/assets/check-circle.svg

alfa-client/libs/design-system/src/assets/check.svg

alfa-client/libs/design-system/src/assets/close.svg

.../libs/design-system/src/assets/delete-vorgang-finally.svg

alfa-client/libs/design-system/src/assets/delete.svg

...-client/libs/design-system/src/assets/discard-vorgang.svg

alfa-client/libs/design-system/src/assets/edit.svg

alfa-client/libs/design-system/src/assets/error.svg