…n passing block (#3953)

## Context

We expect `Utils::ActivityLog.produce_after_commit`:

1. to return the value returned by the block
2. to run the block before the commit but produce the event on Kafka after the commit

The current implementation is not matching those behaviors:

```shell
⋊> lago exec api bundle exec rspec --color --format documentation spec/services/utils/activity_log_spec.rb
Utils::ActivityLog
  .produce_after_commit
    when kafka is configured
      produces the event on kafka after the commit (FAILED - 1)
Failures:

  1) Utils::ActivityLog.produce_after_commit when kafka is configured when providing a block produces the event on kafka after the commit
     Failure/Error: expect(produce_result).to eq(result)
     
       expected: #<BaseService::LegacyResult coupon=#<Coupon id: "61398514-d441-4440-a96c-e586ad240a29", organization_..._plans: false, deleted_at: nil, limited_billable_metrics: false, description: "Coupon Description">>
            got: [#<AfterCommitEverywhere::Wrap:0x0000ffff604a0fc8 @connection=#<ActiveRecord::ConnectionAdapters::Pos...>, @handlers={after_commit: #<Proc:0x0000ffff604a11f8 /app/app/services/utils/activity_log.rb:25>}>]
     
       (compared using ==)
     
       Diff:
       @@ -1 +1 @@
       -#<BaseService::LegacyResult coupon=#<Coupon id: "61398514-d441-4440-a96c-e586ad240a29", organization_id: "9ccf4cec-b0a2-449c-bddf-cffecb000256", name: "new name", code: "m507v7gtmn", status: "active", terminated_at: nil, amount_cents: 200, amount_currency: "EUR", expiration: "no_expiration", created_at: "2023-03-22 12:00:00.000000000 +0000", updated_at: "2023-03-22 12:00:00.000000000 +0000", coupon_type: "fixed_amount", percentage_rate: nil, frequency: "once", frequency_duration: nil, expiration_at: nil, reusable: true, limited_plans: false, deleted_at: nil, limited_billable_metrics: false, description: "Coupon Description">>
       +[#<AfterCommitEverywhere::Wrap:0x0000ffff604a0fc8 @connection=#<ActiveRecord::ConnectionAdapters::PostgreSQLAdapter:0x00000000005360 env_name="test" role=:writing>, @handlers={after_commit: #<Proc:0x0000ffff604a11f8 /app/app/services/utils/activity_log.rb:25>}>]
       
     # ./spec/services/utils/activity_log_spec.rb:93:in 'block (5 levels) in <top (required)>'
     # ...
     # /usr/local/bundle/gems/webmock-3.23.1/lib/webmock/rspec.rb:39:in 'block (2 levels) in <main>'

1 example, 1 failure

Failed examples:

rspec ./spec/services/utils/activity_log_spec.rb:86 # Utils::ActivityLog.produce_after_commit when kafka is configured when providing a block produces the event on kafka after the commit
```

## Description

The fix is to handle the `after_commit` behavior in the `Utils::ActivityLog#produce` instance method after the block is executed.