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/jobs/account/conversations_resolution_scheduler_job_spec.rb

@@ -11,7 +11,7 @@ RSpec.describe Account::ConversationsResolutionSchedulerJob do
   end
 
   it 'enqueues Conversations::ResolutionJob' do
-    account.update(auto_resolve_duration: 10)
+    account.update(auto_resolve_after: 10 * 60 * 24)
     expect(Conversations::ResolutionJob).to receive(:perform_later).with(account: account).once
     described_class.perform_now
   end

spec/jobs/conversations/resolution_job_spec.rb

@@ -18,16 +18,17 @@ RSpec.describe Conversations::ResolutionJob do
   end
 
   it 'resolves the issue if time of inactivity is more than the auto resolve duration' do
-    account.update(auto_resolve_duration: 10)
-    conversation.update(last_activity_at: 13.days.ago)
+    account.update(auto_resolve_after: 14_400) # 10 days in minutes
+    conversation.update(last_activity_at: 13.days.ago, waiting_since: nil)
     described_class.perform_now(account: account)
     expect(conversation.reload.status).to eq('resolved')
   end
 
   it 'resolved only a limited number of conversations in a single execution' do
     stub_const('Limits::BULK_ACTIONS_LIMIT', 2)
-    account.update(auto_resolve_duration: 10)
-    create_list(:conversation, 3, account: account, last_activity_at: 13.days.ago)
+    account.update(auto_resolve_after: 14_400) # 10 days in minutes
+    conversations = create_list(:conversation, 3, account: account, last_activity_at: 13.days.ago)
+    conversations.each { |conversation| conversation.update(waiting_since: nil) }
     described_class.perform_now(account: account)
     expect(account.conversations.resolved.count).to eq(Limits::BULK_ACTIONS_LIMIT)
   end