Chore: Refactor other kinds of message - Phase 2 (#27927)

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

apps/meteor/app/mentions-flextab/client/actionButton.ts

apps/meteor/app/mentions-flextab/client/index.js

...or/app/mentions-flextab/client/views/mentionsFlexTab.html

...teor/app/mentions-flextab/client/views/mentionsFlexTab.js

apps/meteor/app/message-pin/client/actionButton.ts

apps/meteor/app/message-pin/client/index.js

apps/meteor/app/message-pin/client/messageType.js

apps/meteor/app/message-pin/client/pinMessage.js

apps/meteor/app/message-pin/client/views/pinnedMessages.html

apps/meteor/app/message-pin/client/views/pinnedMessages.js

...r/app/message-pin/client/views/stylesheets/messagepin.css

.../message-snippet/client/tabBar/views/snippetedMessages.js

apps/meteor/app/message-star/client/actionButton.ts

apps/meteor/app/message-star/client/index.js

apps/meteor/app/message-star/client/starMessage.js

...meteor/app/message-star/client/views/starredMessages.html

apps/meteor/app/message-star/client/views/starredMessages.js

...app/message-star/client/views/stylesheets/messagestar.css

apps/meteor/app/models/client/models/ChatMessage.ts