chore: Increase character limit for external url fields (#7230)

- Increase the external url field validation to 2048 characters

fixes: https://github.com/chatwoot/chatwoot/issues/7098

app/models/agent_bot.rb

@@ -28,6 +28,7 @@ class AgentBot < ApplicationRecord
   enum bot_type: { webhook: 0, csml: 1 }
 
   validate :validate_agent_bot_config
+  validates :outgoing_url, length: { maximum: Limits::URL_LENGTH_LIMIT }
 
   def available_name
     name

app/models/attachment.rb

@@ -37,7 +37,7 @@ class Attachment < ApplicationRecord
   belongs_to :message
   has_one_attached :file
   validate :acceptable_file
-  validates :external_url, length: { maximum: 1000 }
+  validates :external_url, length: { maximum: Limits::URL_LENGTH_LIMIT }
   enum file_type: [:image, :audio, :video, :file, :location, :fallback, :share, :story_mention, :contact]
 
   def push_event_data

app/models/channel/api.rb

@@ -27,6 +27,7 @@ class Channel::Api < ApplicationRecord
   has_secure_token :identifier
   has_secure_token :hmac_token
   validate :ensure_valid_agent_reply_time_window
+  validates :webhook_url, length: { maximum: Limits::URL_LENGTH_LIMIT }
 
   def name
     'API'