sentry-rails 4.9.0 breaks channels specs

### Issue Description

Recently bumped sentry SKD to 4.9.0 and after that none of my channel specs passes 🙁

I get this error:
```NoMethodError:
       undefined method `env' for #<ActionCable::Channel::ConnectionStub (...)
     # /usr/local/bundle/gems/sentry-rails-4.9.0/lib/sentry/rails/action_cable.rb:72:in `sentry_capture'
     # /usr/local/bundle/gems/sentry-rails-4.9.0/lib/sentry/rails/action_cable.rb:62:in `block (2 levels) in included'
     # /usr/local/bundle/gems/actioncable-6.1.4.4/lib/action_cable/engine.rb:68:in `block (3 levels) in <class:Engine>'
     # /usr/local/bundle/gems/actioncable-6.1.4.4/lib/action_cable/channel/base.rb:180:in `subscribe_to_channel'
     # /usr/local/bundle/gems/actioncable-6.1.4.4/lib/action_cable/channel/test_case.rb:228:in `subscribe'
     # ./spec/channels/agent_call_channel_spec.rb:7:in `block (2 levels) in <top (required)>'
```

Spec looks like this:
```ruby
it "subscribes to a stream" do
    stub_connection cable_agent: agent

    subscribe

    expect(subscription).to be_confirmed
    assert_has_stream_for agent
end

```

I looked into `ActionCable` source and found out there is no `env` accessor for `ActionCable::Channel::ConnectionStub` class.

[ActionCable::Connection](https://github.com/rails/rails/blob/6-1-stable/actioncable/lib/action_cable/connection/base.rb)
[ActionCable::Channel::ConnectionStub](https://github.com/rails/rails/blob/6-1-stable/actioncable/lib/action_cable/channel/test_case.rb)

I do not see clear solution here, but maybe SDK could extend `ActionCable::Channel::ConnectionStub` and add `.env` attribute?


### Reproduction Steps

Just prepare any channel spec using `stub_connection` helper.

### Expected Behavior

Sentry SDK is not breaking any specs.

### Actual Behavior

Sentry SDK is breaking channel specs.

### Ruby Version

3.0.3

### SDK Version

4.9.0

### Integration and Its Version

Rails 6.1.4.4

### Sentry Config

_No response_

Provide feedback

Saved searches

Use saved searches to filter your results more quickly

Uh oh!

sentry-rails 4.9.0 breaks channels specs #1685

Issue Description

Reproduction Steps

Expected Behavior

Actual Behavior

Ruby Version

SDK Version

Integration and Its Version

Sentry Config

Metadata

Assignees

Labels

Fields

Projects

Milestone

Relationships

Development

Uh oh!

sentry-rails 4.9.0 breaks channels specs #1685

Description

Issue Description

Reproduction Steps

Expected Behavior

Actual Behavior

Ruby Version

SDK Version

Integration and Its Version

Sentry Config

Metadata

Metadata

Assignees

Labels

Fields

Projects

Milestone

Relationships

Development

Issue actions