Move escapeFileUrl to shared url_utility

**Why?**
This is no longer needed in just the IDE.
We also need it to make sure we properly
escape paths in the file finder.

app/assets/javascripts/ide/lib/files.js

 import { viewerInformationForPath } from '~/vue_shared/components/content_viewer/lib/viewer_utils';
-import { decorateData, sortTree, escapeFileUrl } from '../stores/utils';
+import { escapeFileUrl } from '~/lib/utils/url_utility';
+import { decorateData, sortTree } from '../stores/utils';
 
 export const splitParent = path => {
   const idx = path.lastIndexOf('/');

app/assets/javascripts/ide/services/index.js

 import axios from '~/lib/utils/axios_utils';
-import { joinPaths } from '~/lib/utils/url_utility';
-import { escapeFileUrl } from '../stores/utils';
+import { joinPaths, escapeFileUrl } from '~/lib/utils/url_utility';
 import Api from '~/api';
 
 export default {

app/assets/javascripts/ide/stores/actions/file.js

-import { joinPaths } from '~/lib/utils/url_utility';
+import { joinPaths, escapeFileUrl } from '~/lib/utils/url_utility';
 import { __ } from '~/locale';
 import eventHub from '../../eventhub';
 import service from '../../services';
 import * as types from '../mutation_types';
 import router from '../../ide_router';
-import { escapeFileUrl, addFinalNewlineIfNeeded, setPageTitleForFile } from '../utils';
+import { addFinalNewlineIfNeeded, setPageTitleForFile } from '../utils';
 import { viewerTypes, stageKeys } from '../../constants';
 
 export const closeFile = ({ commit, state, dispatch }, file) => {

app/assets/javascripts/ide/stores/utils.js

 import { commitActionTypes, FILE_VIEW_MODE_EDITOR } from '../constants';
+import { escapeFileUrl } from '~/lib/utils/url_utility';
 
 export const dataStructure = () => ({
   id: '',
@@ -217,8 +218,6 @@ export const mergeTrees = (fromTree, toTree) => {
   return toTree;
 };
 
-export const escapeFileUrl = fileUrl => encodeURIComponent(fileUrl).replace(/%2F/g, '/');
-
 export const replaceFileUrl = (url, oldPath, newPath) => {
   // Add `/-/` so that we don't accidentally replace project path
   const result = url.replace(`/-/${escapeFileUrl(oldPath)}`, `/-/${escapeFileUrl(newPath)}`);

app/assets/javascripts/lib/utils/url_utility.js

@@ -280,3 +280,5 @@ export const setUrlParams = (params, url = window.location.href, clearParams = f
 
   return urlObj.toString();
 };
+
+export const escapeFileUrl = fileUrl => encodeURIComponent(fileUrl).replace(/%2F/g, '/');

spec/frontend/ide/lib/files_spec.js

 import { viewerInformationForPath } from '~/vue_shared/components/content_viewer/lib/viewer_utils';
 import { decorateFiles, splitParent } from '~/ide/lib/files';
-import { decorateData, escapeFileUrl } from '~/ide/stores/utils';
+import { decorateData } from '~/ide/stores/utils';
+import { escapeFileUrl } from '~/lib/utils/url_utility';
 
 const TEST_BRANCH_ID = 'lorem-ipsum';
 const TEST_PROJECT_ID = 10;

spec/frontend/ide/services/index_spec.js

@@ -2,7 +2,7 @@ import axios from 'axios';
 import MockAdapter from 'axios-mock-adapter';
 import services from '~/ide/services';
 import Api from '~/api';
-import { escapeFileUrl } from '~/ide/stores/utils';
+import { escapeFileUrl } from '~/lib/utils/url_utility';
 
 jest.mock('~/api');
 

spec/frontend/ide/stores/utils_spec.js

@@ -395,14 +395,6 @@ describe('Multi-file store utils', () => {
     });
   });
 
-  describe('escapeFileUrl', () => {
-    it('encodes URL excluding the slashes', () => {
-      expect(utils.escapeFileUrl('/foo-bar/file.md')).toBe('/foo-bar/file.md');
-      expect(utils.escapeFileUrl('foo bar/file.md')).toBe('foo%20bar/file.md');
-      expect(utils.escapeFileUrl('foo/bar/file.md')).toBe('foo/bar/file.md');
-    });
-  });
-
   describe('swapInStateArray', () => {
     let localState;
 

spec/frontend/lib/utils/url_utility_spec.js

@@ -322,6 +322,14 @@ describe('URL utility', () => {
       expect(urlUtils.joinPaths(...paths)).toBe(expected);
     });
   });
+
+  describe('escapeFileUrl', () => {
+    it('encodes URL excluding the slashes', () => {
+      expect(urlUtils.escapeFileUrl('/foo-bar/file.md')).toBe('/foo-bar/file.md');
+      expect(urlUtils.escapeFileUrl('foo bar/file.md')).toBe('foo%20bar/file.md');
+      expect(urlUtils.escapeFileUrl('foo/bar/file.md')).toBe('foo/bar/file.md');
+    });
+  });
 });
 
 describe('setUrlParams', () => {