Remove dead code from the Web IDE

- file object property: lastCommit
- mutation SET_LAST_COMMIT_DATA

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

 export const SET_INITIAL_DATA = 'SET_INITIAL_DATA';
 export const TOGGLE_LOADING = 'TOGGLE_LOADING';
-export const SET_LAST_COMMIT_DATA = 'SET_LAST_COMMIT_DATA';
 export const SET_LAST_COMMIT_MSG = 'SET_LAST_COMMIT_MSG';
 export const SET_RESIZING_STATUS = 'SET_RESIZING_STATUS';
 export const SET_EMPTY_STATE_SVGS = 'SET_EMPTY_STATE_SVGS';

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

@@ -34,15 +34,6 @@ export default {
       panelResizing: resizing,
     });
   },
-  [types.SET_LAST_COMMIT_DATA](state, { entry, lastCommit }) {
-    Object.assign(entry.lastCommit, {
-      id: lastCommit.commit.id,
-      url: lastCommit.commit_path,
-      message: lastCommit.commit.message,
-      author: lastCommit.commit.author_name,
-      updatedAt: lastCommit.commit.authored_date,
-    });
-  },
   [types.SET_LAST_COMMIT_MSG](state, lastCommitMsg) {
     Object.assign(state, {
       lastCommitMsg,

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

@@ -25,13 +25,6 @@ export const dataStructure = () => ({
   changed: false,
   staged: false,
   lastCommitSha: '',
-  lastCommit: {
-    id: '',
-    url: '',
-    message: '',
-    updatedAt: '',
-    author: '',
-  },
   rawPath: '',
   binary: false,
   raw: '',

spec/frontend/ide/commit_icon_spec.js

@@ -11,7 +11,6 @@ const createFile = (name = 'name', id = name, type = '', parent = null) =>
     name,
     path: parent ? `${parent.path}/${name}` : name,
     parentPath: parent ? parent.path : '',
-    lastCommit: {},
   });
 
 describe('getCommitIconMap', () => {

spec/frontend/ide/helpers.js

@@ -30,7 +30,6 @@ export const file = (name = 'name', id = name, type = '', parent = null) =>
     name,
     path: parent ? `${parent.path}/${name}` : name,
     parentPath: parent ? parent.path : '',
-    lastCommit: {},
   });
 
 export const createEntriesFromPaths = paths =>