Add eslint rule no-floating-promises (#7789)

* add eslint rule no-floating-promises

* add eslint-disable comment to offending lines

libs/components/src/radio-button/radio-button.component.spec.ts

@@ -27,6 +27,8 @@ describe("RadioButton", () => {
       ],
     });
 
+    // FIXME: Verify that this floating promise is intentional. If it is, add an explanatory comment and ensure there is proper error handling.
+    // eslint-disable-next-line @typescript-eslint/no-floating-promises
     TestBed.compileComponents();
     fixture = TestBed.createComponent(TestApp);
     fixture.detectChanges();