Remove tests and conditions for unsupported technologies

[hannahramadan]

Ruby agent release 9.0.0 removed support for the following previously deprecated technologies:

- Passenger: 2.2.x - 4.0.x
- Puma: 2.0.x
- Grape: 0.2.0
- Padrino: 0.14.x
- Rails: 3.2.x
- Sinatra: 1.4.x, 1.5.x
- Mongo: 1.8.x - 2.3.x
- Sequel: 3.37.x, 4.0.x
- Delayed_Job: 2.0.x - 4.0.x
- Sidekiq: 4.2.x
- Excon: below 0.55.0
- HttpClient: 2.2.0 - 2.8.0
- HttpRb: 0.9.9 - 2.2.1
- Typhoeus: 0.5.3 - 1.2.x
- Bunny: 2.0.x - 2.6.x 
- ActiveMerchant: 1.25.0 - 1.64.x

We should remove any tests and code conditions related to the above technologies and their now unsupported versions.

[workato-integration]

https://issues.newrelic.com/browse/NEWRELIC-6932