chore: Update the precision of the updated_at timestamp in conversation model (#10875)

Use to_f instead of to_i to preserve the millisecond precision in the UI.

app/presenters/conversations/event_data_presenter.rb

@@ -43,7 +43,7 @@ class Conversations::EventDataPresenter < SimpleDelegator
       last_activity_at: last_activity_at.to_i,
       timestamp: last_activity_at.to_i,
       created_at: created_at.to_i,
-      updated_at: updated_at.to_i
+      updated_at: updated_at.to_f
     }
   end
 end

app/views/api/v1/conversations/partials/_conversation.json.jbuilder

@@ -44,7 +44,7 @@ json.muted conversation.muted?
 json.snoozed_until conversation.snoozed_until
 json.status conversation.status
 json.created_at conversation.created_at.to_i
-json.updated_at conversation.updated_at.to_i
+json.updated_at conversation.updated_at.to_f
 json.timestamp conversation.last_activity_at.to_i
 json.first_reply_created_at conversation.first_reply_created_at.to_i
 json.unread_count conversation.unread_incoming_messages.count

spec/models/conversation_spec.rb

@@ -538,7 +538,7 @@ RSpec.describe Conversation do
         contact_last_seen_at: conversation.contact_last_seen_at.to_i,
         agent_last_seen_at: conversation.agent_last_seen_at.to_i,
         created_at: conversation.created_at.to_i,
-        updated_at: conversation.updated_at.to_i,
+        updated_at: conversation.updated_at.to_f,
         waiting_since: conversation.waiting_since.to_i,
         priority: nil,
         unread_count: 0

spec/presenters/conversations/event_data_presenter_spec.rb

@@ -31,7 +31,7 @@ RSpec.describe Conversations::EventDataPresenter do
         contact_last_seen_at: conversation.contact_last_seen_at.to_i,
         agent_last_seen_at: conversation.agent_last_seen_at.to_i,
         created_at: conversation.created_at.to_i,
-        updated_at: conversation.updated_at.to_i,
+        updated_at: conversation.updated_at.to_f,
         waiting_since: conversation.waiting_since.to_i,
         priority: nil,
         unread_count: 0