Refactor timeline event list

What does this MR do and why?

Describe in detail what your merge request does and why.

In order to allow that addition of edit functionality in timeline events as in #344060 (closed), the timeline event list must be refactored so that app/assets/javascripts/issues/show/components/incidents/timeline_events_form.vue can be used within the list.

No visual changes, only refactoring

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MR acceptance checklist

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app/assets/javascripts/issues/show/components/incidents/timeline_events_list.vue

@@ -4,7 +4,7 @@ import { createAlert } from '~/flash';
 import { sprintf } from '~/locale';
 import { confirmAction } from '~/lib/utils/confirm_via_gl_modal/confirm_via_gl_modal';
 import { ignoreWhilePending } from '~/lib/utils/ignore_while_pending';
-import IncidentTimelineEventItem from './timeline_events_list_item.vue';
+import IncidentTimelineEventItem from './timeline_events_item.vue';
 import deleteTimelineEvent from './graphql/queries/delete_timeline_event.mutation.graphql';
 import { timelineListI18n } from './constants';