Fix cross agent tests

[jasonjkeller]

Resolves https://github.com/newrelic/newrelic-java-agent/issues/1752

Fixes the issue that was preventing us from updating the cross_agent_tests and pulls in the latest updates from that repo (which we have been blocked on since the agent repo was open sourced).

Fixes a few tests that were failing after being updated.

The attribute_java_only.json file has been deleted as it doesn't exist in the cross_agent_tests repo and we didn't have any tests actually running against it. If we ever wanted to add tests we could recreate the file in the uncross_agent_tests directory.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 70.66%. Comparing base (464aa44) to head (a1d3370). Report is 4 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1926 +/- ## ============================================ - Coverage 70.68% 70.66% -0.02% + Complexity 9861 9858 -3 ============================================ Files 826 826 Lines 39792 39792 Branches 6061 6061 ============================================ - Hits 28127 28120 -7 - Misses 8946 8948 +2 - Partials 2719 2724 +5 ```

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