[FIX] Integrations avatar attribute misuse (#25283)

apps/meteor/app/api/server/lib/integrations.ts

apps/meteor/app/api/server/v1/integrations.ts

apps/meteor/app/integrations/lib/outgoingEvents.ts

apps/meteor/app/integrations/lib/rocketchat.js

apps/meteor/app/integrations/server/index.js

apps/meteor/app/integrations/server/lib/triggerHandler.js

...pp/integrations/server/lib/validateOutgoingIntegration.ts

...rations/server/methods/incoming/addIncomingIntegration.ts

...rations/server/methods/outgoing/addOutgoingIntegration.js

...rations/server/methods/outgoing/addOutgoingIntegration.ts

...ions/server/methods/outgoing/updateOutgoingIntegration.js

apps/meteor/app/models/server/raw/Integrations.ts

...or/client/views/admin/integrations/IncomingWebhookForm.js

...r/client/views/admin/integrations/OutgoiongWebhookForm.js

...ient/views/admin/integrations/edit/EditIncomingWebhook.js

...ient/views/admin/integrations/edit/EditOutgoingWebhook.js

...eteor/client/views/admin/integrations/edit/HistoryItem.js

...client/views/admin/integrations/new/NewIncomingWebhook.js

apps/meteor/definition/externals/meteor/babel-compiler.d.ts

apps/meteor/server/startup/migrations/index.ts