OZG-7474 Rename back arrow icon

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

...ystem/src/lib/icons/undo-icon/undo-icon.component.spec.ts

...ign-system/src/lib/icons/undo-icon/undo-icon.component.ts

...esign-system/src/lib/icons/undo-icon/undo-icon.stories.ts

...dereroeffnen-button/wiedereroeffnen-button.component.html

...eroeffnen-button/wiedereroeffnen-button.component.spec.ts

...ns/zurueckholen-button/zurueckholen-button.component.html

...zurueckholen-button/zurueckholen-button.component.spec.ts

...urueckstellen-button/zurueckstellen-button.component.html

...eckstellen-button/zurueckstellen-button.component.spec.ts

...ient/libs/vorgang-detail/src/lib/vorgang-detail.module.ts