Fix es lint errors and warnings and enforce es lint as build breaker. (#1878)

Co-authored-by: Konstantin Schaper <konstantin.schaper@cloudogu.com>

scm-ui/ui-webapp/src/repos/sources/utils/files.test.ts

@@ -33,8 +33,8 @@ describe("files tests", () => {
       directory: true,
       _links: {},
       _embedded: {
-        children: [],
-      },
+        children: []
+      }
     };
   };
 
@@ -43,7 +43,7 @@ describe("files tests", () => {
     path: "README.md",
     revision: "42",
     directory: false,
-    _links: {},
+    _links: {}
   };
 
   describe("isRootPath tests", () => {