feat: Allow admins to decide if email transcript should be sent always (#32820)

.changeset/shaggy-hats-raise.md

apps/meteor/app/livechat/server/lib/LivechatTyped.ts

apps/meteor/app/livechat/server/lib/localTypes.ts

.../meteor/app/livechat/server/lib/parseTranscriptRequest.ts

...r/client/components/Omnichannel/modals/CloseChatModal.tsx

.../views/account/omnichannel/OmnichannelPreferencesPage.tsx

...account/omnichannel/PreferencesConversationTranscript.tsx

apps/meteor/server/settings/omnichannel.ts

...it/app/livechat/server/lib/parseTranscriptRequest.spec.ts

packages/i18n/src/locales/en.i18n.json

packages/i18n/src/locales/es.i18n.json

packages/i18n/src/locales/fi.i18n.json

packages/i18n/src/locales/pt-BR.i18n.json

packages/i18n/src/locales/ru.i18n.json

packages/i18n/src/locales/sv.i18n.json