Remove already defined shared example

Removing the time traking shared example as it was actually moved
under time_tracking_quick_action_shared_examples.rb filename to a
different path as part of spec refactorign for quick action

https://gitlab.com/gitlab-org/gitlab-ce/issues/50199
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/26095

spec/support/shared_examples/time_tracking_shared_examples.rb

-shared_examples 'issuable time tracker' do
-  it 'renders the sidebar component empty state' do
-    page.within '.time-tracking-no-tracking-pane' do
-      expect(page).to have_content 'No estimate or time spent'
-    end
-  end
-
-  it 'updates the sidebar component when estimate is added' do
-    submit_time('/estimate 3w 1d 1h')
-
-    wait_for_requests
-    page.within '.time-tracking-estimate-only-pane' do
-      expect(page).to have_content '3w 1d 1h'
-    end
-  end
-
-  it 'updates the sidebar component when spent is added' do
-    submit_time('/spend 3w 1d 1h')
-
-    wait_for_requests
-    page.within '.time-tracking-spend-only-pane' do
-      expect(page).to have_content '3w 1d 1h'
-    end
-  end
-
-  it 'shows the comparison when estimate and spent are added' do
-    submit_time('/estimate 3w 1d 1h')
-    submit_time('/spend 3w 1d 1h')
-
-    wait_for_requests
-    page.within '.time-tracking-comparison-pane' do
-      expect(page).to have_content '3w 1d 1h'
-    end
-  end
-
-  it 'updates the sidebar component when estimate is removed' do
-    submit_time('/estimate 3w 1d 1h')
-    submit_time('/remove_estimate')
-
-    page.within '.time-tracking-component-wrap' do
-      expect(page).to have_content 'No estimate or time spent'
-    end
-  end
-
-  it 'updates the sidebar component when spent is removed' do
-    submit_time('/spend 3w 1d 1h')
-    submit_time('/remove_time_spent')
-
-    page.within '.time-tracking-component-wrap' do
-      expect(page).to have_content 'No estimate or time spent'
-    end
-  end
-
-  it 'shows the help state when icon is clicked' do
-    page.within '.time-tracking-component-wrap' do
-      find('.help-button').click
-      expect(page).to have_content 'Track time with quick actions'
-      expect(page).to have_content 'Learn more'
-    end
-  end
-
-  it 'hides the help state when close icon is clicked' do
-    page.within '.time-tracking-component-wrap' do
-      find('.help-button').click
-      find('.close-help-button').click
-
-      expect(page).not_to have_content 'Track time with quick actions'
-      expect(page).not_to have_content 'Learn more'
-    end
-  end
-
-  it 'displays the correct help url' do
-    page.within '.time-tracking-component-wrap' do
-      find('.help-button').click
-
-      expect(find_link('Learn more')[:href]).to have_content('/help/workflow/time_tracking.md')
-    end
-  end
-end
-
-def submit_time(quick_action)
-  fill_in 'note[note]', with: quick_action
-  find('.js-comment-submit-button').click
-  wait_for_requests
-end