Add Snowplow event definitions for the converted events

...ig/events/g_project_management_issue_assignee_changed.yml

config/events/g_project_management_issue_cloned.yml

config/events/g_project_management_issue_closed.yml

config/events/g_project_management_issue_comment_added.yml

config/events/g_project_management_issue_comment_edited.yml

config/events/g_project_management_issue_comment_removed.yml

...ig/events/g_project_management_issue_cross_referenced.yml

...events/g_project_management_issue_description_changed.yml

...ts/g_project_management_issue_design_comments_removed.yml

config/events/g_project_management_issue_designs_added.yml

...ig/events/g_project_management_issue_designs_modified.yml

config/events/g_project_management_issue_designs_removed.yml

...ig/events/g_project_management_issue_due_date_changed.yml

config/events/g_project_management_issue_label_changed.yml

config/events/g_project_management_issue_locked.yml

...g/events/g_project_management_issue_made_confidential.yml

config/events/g_project_management_issue_made_visible.yml

...events/g_project_management_issue_marked_as_duplicate.yml

...g/events/g_project_management_issue_milestone_changed.yml

config/events/g_project_management_issue_moved.yml