CI: Get JRuby CI working with the Rails 7.0 test suite

[fallwith]

With the ci_jruby workflow, we currently test JRuby against Rails v6.1. We would like to switch to testing against Rails v7.0 (or even v7.1 once #2266 delivers it). Only 1 Rails version needs to be tested. Three issues prevent us from moving to v7.0/v7.1:

1. NewRelic::Agent::Instrumentation::ActionControllerSubscriberTest#test_records_filtered_request_params_in_txn fails on unfiltered data
2. test/new_relic/control_test.rb:35 produces the wrong db adapter value
3. The Rails test suite's use of a Bloodhound class results in an uninitialized constant Bloodhound error, despite the class bearing no differences between the v6.1 and v7.0 test suites.

[workato-integration]

https://new-relic.atlassian.net/browse/NR-183136