Add ability to configure a worker_queue and remove Fabric::WebhookWorker

[jclusso]

• This works by overriding the perform_async method. I was surprised this works, but it does.
• Additionally, Fabric::WebhookWorker has been removed. Using it is not ideal as it silences errors that Stripe would normally retry.

[jclusso]

@danarnold I fixed this PR to support those options.

[Copilot]

Pull Request Overview

This PR adds the ability to configure the worker queue via a new Fabric.config attribute and removes the legacy Fabric::WebhookWorker to ensure errors aren’t silenced during Stripe webhook processing.

• Overrides perform_async, perform_in, and perform_at in Worker to dynamically set the queue from configuration.
• Removes the Fabric::WebhookWorker and updates the documentation and configuration accordingly.

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
lib/fabric/app/workers/worker.rb	Overrides asynchronous methods to use the configurable queue, removing the hard-coded 'fabric' queue.
lib/fabric/app/workers/webhook_worker.rb	Completely removed as part of deprecating error-silencing webhook processing.
lib/fabric.rb	Updates require statements and adds a new worker_queue configuration with default value 'critical'.
README.md	Removes outdated asynchronous usage instructions referencing the removed WebhookWorker.

Comments suppressed due to low confidence (2)

lib/fabric/app/workers/worker.rb:38

• Consider adding a brief inline comment explaining why perform_async, perform_in, and perform_at are overridden to set the queue dynamically using Fabric.config.worker_queue. This will improve maintainability and ease future modifications.

def perform_async(...)

lib/fabric.rb:145

• It would be beneficial to include a comment or update related documentation to explain the purpose and expected values for the new worker_queue configuration attribute.

attr_accessor :worker_queue