use new endpoints for sys-check functions

src/app/sys-check/backend.service.ts

src/app/sys-check/network-check/network-check.component.ts

src/app/sys-check/report/report.component.ts

src/app/sys-check/start.component.ts

src/app/sys-check/sys-check-data.service.ts

src/app/sys-check/sys-check-routing.module.ts

src/app/sys-check/sys-check.component.ts

src/app/sys-check/sys-check.interfaces.ts

src/app/sys-check/unit-check/unit-check.component.ts