Update environments default branch name

Updated the branch name from master to main

ee/spec/frontend/environments/mock_data.js

@@ -9,8 +9,8 @@ export const environment = {
     iid: 6,
     sha: '500aabcb17c97bdcf2d0c410b70cb8556f0362dd',
     ref: {
-      name: 'master',
-      ref_url: 'root/ci-folders/tree/master',
+      name: 'main',
+      ref_url: 'root/ci-folders/tree/main',
     },
     tag: true,
     'last?': true,

spec/frontend/environments/environment_table_spec.js

@@ -359,7 +359,7 @@ describe('Environment table', () => {
               },
             },
             {
-              name: 'review/master',
+              name: 'review/main',
               last_deployment: {
                 created_at: '2019-02-17T16:26:15.125Z',
               },
@@ -374,7 +374,7 @@ describe('Environment table', () => {
         },
       ];
       const [production, review, staging] = mockItems;
-      const [addcibuildstatus, master] = mockItems[1].children;
+      const [addcibuildstatus, main] = mockItems[1].children;
 
       factory({
         propsData: {
@@ -390,7 +390,7 @@ describe('Environment table', () => {
         production.name,
       ]);
 
-      expect(wrapper.vm.sortedEnvironments[0].children).toEqual([master, addcibuildstatus]);
+      expect(wrapper.vm.sortedEnvironments[0].children).toEqual([main, addcibuildstatus]);
     });
   });
 });

spec/frontend/environments/mock_data.js

@@ -76,8 +76,8 @@ const environment = {
     iid: 6,
     sha: '500aabcb17c97bdcf2d0c410b70cb8556f0362dd',
     ref: {
-      name: 'master',
-      ref_url: 'root/ci-folders/tree/master',
+      name: 'main',
+      ref_url: 'root/ci-folders/tree/main',
     },
     tag: true,
     'last?': true,
@@ -130,8 +130,8 @@ const environment = {
     iid: 27,
     sha: '1132df044b73943943c949e7ac2c2f120a89bf59',
     ref: {
-      name: 'master',
-      ref_path: '/root/environment-test/-/tree/master',
+      name: 'main',
+      ref_path: '/root/environment-test/-/tree/main',
     },
     status: 'running',
     created_at: '2020-12-04T19:57:49.514Z',