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>

db/migrate/20250421082927_add_settings_column_to_account.rb

@@ -0,0 +1,5 @@
+class AddSettingsColumnToAccount < ActiveRecord::Migration[7.0]
+  def change
+    add_column :accounts, :settings, :jsonb, default: {}
+  end
+end

db/migrate/20250421085134_update_auto_resolve_to_mminutes.rb

@@ -0,0 +1,8 @@
+class UpdateAutoResolveToMminutes < ActiveRecord::Migration[7.0]
+  def change
+    Account.where.not(auto_resolve_duration: nil).each do |account|
+      account.auto_resolve_after = account.auto_resolve_duration * 60 * 24
+      account.save!
+    end
+  end
+end