Allow the agent to instrument Rails dependencies on their own

[kaylareopelle]

Description

Currently, Active Record is the only confirmed library that can be instrumented outside of a Rails context. We've tried to design the dependency detection logic for other Rails-related gems (Active Support, Action Controller, etc.) to install instrumentation when the Rails gem is absent, but don't have tests to verify this behavior

Acceptance Criteria

• Write tests that allow the following gems to be instrumented when the rails gem is absent:
  • actioncontroller
  • activejob
  • actioncable
  • activesupport
  • activestorage
  • actionview
  • actiondispatch
  • actionmailer
  • actionmailbox

Design Consideration/Limitations

If unit tests are too difficult, a repeatable playground-based test could be used instead

Dependencies

None

Additional context

Internal conversations:

• https://newrelic.slack.com/archives/GGXADQ9F1/p1674692812704149
• https://newrelic.slack.com/archives/GGXADQ9F1/p1674692908788339
• https://newrelic.slack.com/archives/GGXADQ9F1/p1674692944974439

Estimates

S

[workato-integration]

https://issues.newrelic.com/browse/NEWRELIC-6515