MR refactor DRY setInlineDiffViewType and setParallelDiffViewType actions

These 2 actions repeat the non vuex code in both, they can be DRY

export const setInlineDiffViewType = ({ commit }) => {
  commit(types.SET_DIFF_VIEW_TYPE, INLINE_DIFF_VIEW_TYPE);

  Cookies.set(DIFF_VIEW_COOKIE_NAME, INLINE_DIFF_VIEW_TYPE);
  const url = mergeUrlParams({ view: INLINE_DIFF_VIEW_TYPE }, window.location.href);
  historyPushState(url);
};

export const setParallelDiffViewType = ({ commit }) => {
  commit(types.SET_DIFF_VIEW_TYPE, PARALLEL_DIFF_VIEW_TYPE);

  Cookies.set(DIFF_VIEW_COOKIE_NAME, PARALLEL_DIFF_VIEW_TYPE);
  const url = mergeUrlParams({ view: PARALLEL_DIFF_VIEW_TYPE }, window.location.href);
  historyPushState(url);
};