Part-4: Add event definition files for all snowplow events

config/events/add_work_item_comment.yml

config/events/assigned_user.yml

config/events/cancel_delete_work_item.yml

config/events/click_compare_plans.yml

config/events/click_contact_sales.yml

config/events/click_create_issue_from_error.yml

...ents/click_email_issue_project_issues_empty_list_page.yml

config/events/click_end_tutorial_button.yml

config/events/click_error_link_to_sentry.yml

config/events/click_filter_tabs.yml

.../events/click_jira_int_project_issues_empty_list_page.yml

...vents/click_learn_more_project_issues_empty_list_page.yml

...events/click_new_issue_project_issues_empty_list_page.yml

config/events/click_register_from_sign_in_page.yml

config/events/click_retry.yml

config/events/click_show_full_path.yml

config/events/click_sign_in_from_registration_page.yml

config/events/click_todo.yml

config/events/click_toggle.yml

config/events/filter_ignored_status.yml