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Test webmachine instrumentation to set params
I noticed the webmachine tests don't test if it sets the params, now it does.
Also clean up some other spec stuff that's not needed.
Test webmachine custom action names
Use a Webmachine resource to test the instrumentation. Use that to set a custom action name and test that it doesn't get overwritten by the instrumentation.
Support nested webmachine apps
Apply the same logic as we have in the AbstractMiddleware for webmachine apps. When a parent transaction is active, use that and don't create a new one. More importantly, don't close the active transaction.
The webmachine instrumentation can't use the AbstractMiddleware, or any middleware, as this discouraged by the webmachine project. In practice I don't see this happening, but if someone happens to add an AppSignal EventHandler to the middleware stack in
config.ru
, we now support it.Part of #329