feat: Add support for minutes in auto resolve feature (#11269)

### Summary

- Converts conversation auto-resolution duration from days to minutes
for more
granular control
- Updates validation to allow values from 10 minutes (minimum) to 999
days (maximum)
- Implements smart messaging to show appropriate time units in activity
messages

###  Changes

- Created migration to convert existing durations from days to minutes
(x1440)
- Updated conversation resolver to use minutes instead of days
- Added dynamic translation key selection based on duration value
- Updated related specs and documentation
- Added support for displaying durations in days, hours, or minutes
based on value

###  Test plan

- Verify account validation accepts new minute-based ranges
- Confirm existing account settings are correctly migrated
- Test auto-resolution works properly with minute values
- Ensure proper time unit display in activity messages

---------

Co-authored-by: Sivin Varghese <64252451+iamsivin@users.noreply.github.com>

spec/models/conversation_spec.rb

@@ -213,11 +213,18 @@ RSpec.describe Conversation do
     end
 
     it 'adds a message for system auto resolution if marked resolved by system' do
-      account.update(auto_resolve_duration: 40)
+      account.update(auto_resolve_after: 40 * 24 * 60)
       conversation2 = create(:conversation, status: 'open', account: account, assignee: old_assignee)
       Current.user = nil
 
-      system_resolved_message = "Conversation was marked resolved by system due to #{account.auto_resolve_duration} days of inactivity"
+      message_data = if account.auto_resolve_after >= 1440 && account.auto_resolve_after % 1440 == 0
+                       { key: 'auto_resolved_days', count: account.auto_resolve_after / 1440 }
+                     elsif account.auto_resolve_after >= 60 && account.auto_resolve_after % 60 == 0
+                       { key: 'auto_resolved_hours', count: account.auto_resolve_after / 60 }
+                     else
+                       { key: 'auto_resolved_minutes', count: account.auto_resolve_after }
+                     end
+      system_resolved_message = "Conversation was marked resolved by system due to #{message_data[:count]} days of inactivity"
       expect { conversation2.update(status: :resolved) }
         .to have_enqueued_job(Conversations::ActivityMessageJob)
         .with(conversation2, { account_id: conversation2.account_id, inbox_id: conversation2.inbox_id, message_type: :activity,