FEATURE: Allow durations < 1 hour and < 1 day for topic timers where duration is specified (auto delete replies, close based on last post) (#11961)

This PR allows entering a float value for topic timers e.g. 0.5 for 30 minutes when entering hours, 0.5 for 12 hours when entering days. This is achieved by adding a new column to store the duration of a topic timer in minutes instead of the ambiguous both hours and days that it could be before.

This PR has ommitted the post migration to delete the duration column in topic timers; it will be done in a subsequent PR to ensure that no data is lost if the UPDATE query to set duration_mintues fails.

I have to keep the old keyword of duration in set_or_create_topic_timer for backwards compat, will remove at a later date after plugins are updated.

spec/requests/topics_controller_spec.rb

@@ -3081,7 +3081,7 @@ RSpec.describe TopicsController do
         expect(DateTime.parse(json['execute_at']))
           .to eq_time(DateTime.parse(topic_status_update.execute_at.to_s))
 
-        expect(json['duration']).to eq(topic_status_update.duration)
+        expect(json['duration_minutes']).to eq(topic_status_update.duration_minutes)
         expect(json['closed']).to eq(topic.reload.closed)
       end
 
@@ -3099,13 +3099,13 @@ RSpec.describe TopicsController do
         json = response.parsed_body
 
         expect(json['execute_at']).to eq(nil)
-        expect(json['duration']).to eq(nil)
+        expect(json['duration_minutes']).to eq(nil)
         expect(json['closed']).to eq(topic.closed)
       end
 
       it 'should be able to create a topic status update with duration' do
         post "/t/#{topic.id}/timer.json", params: {
-          duration: 5,
+          duration_minutes: 7200,
           status_type: TopicTimer.types[7]
         }
 
@@ -3115,14 +3115,14 @@ RSpec.describe TopicsController do
 
         expect(topic_status_update.topic).to eq(topic)
         expect(topic_status_update.execute_at).to eq_time(5.days.from_now)
-        expect(topic_status_update.duration).to eq(5)
+        expect(topic_status_update.duration_minutes).to eq(7200)
 
         json = response.parsed_body
 
         expect(DateTime.parse(json['execute_at']))
           .to eq_time(DateTime.parse(topic_status_update.execute_at.to_s))
 
-        expect(json['duration']).to eq(topic_status_update.duration)
+        expect(json['duration_minutes']).to eq(topic_status_update.duration_minutes)
       end
 
       it 'should be able to delete a topic status update for delete_replies type' do