test(e2e): Avoid duplicated visitor names (#32840)

apps/meteor/tests/e2e/omnichannel/omnichannel-agents.spec.ts

.../omnichannel/omnichannel-auto-onhold-chat-closing.spec.ts

...channel/omnichannel-auto-transfer-unanswered-chat.spec.ts

.../omnichannel/omnichannel-canned-responses-sidebar.spec.ts

...hannel/omnichannel-changing-room-priority-and-sla.spec.ts

...or/tests/e2e/omnichannel/omnichannel-chat-history.spec.ts

...teor/tests/e2e/omnichannel/omnichannel-close-chat.spec.ts

...r/tests/e2e/omnichannel/omnichannel-close-inquiry.spec.ts

...or/tests/e2e/omnichannel/omnichannel-contact-info.spec.ts

...or/tests/e2e/omnichannel/omnichannel-livechat-api.spec.ts

...mnichannel/omnichannel-livechat-avatar-visibility.spec.ts

...s/e2e/omnichannel/omnichannel-livechat-background.spec.ts

...s/e2e/omnichannel/omnichannel-livechat-department.spec.ts

...s/e2e/omnichannel/omnichannel-livechat-fileupload.spec.ts

...channel/omnichannel-livechat-message-bubble-color.spec.ts

...mnichannel/omnichannel-livechat-tab-communication.spec.ts

...ts/e2e/omnichannel/omnichannel-livechat-watermark.spec.ts

...meteor/tests/e2e/omnichannel/omnichannel-livechat.spec.ts

...ts/e2e/omnichannel/omnichannel-priorities-sidebar.spec.ts

...s/e2e/omnichannel/omnichannel-send-pdf-transcript.spec.ts