Thread Profile / Backtrace 3.4.0 fixes

[kaylareopelle]

Closes #2992

CI, passing on the relevant runs: https://github.com/newrelic/newrelic-ruby-agent/actions/runs/12403980066

[github-actions]

SimpleCov Report

	Coverage	Threshold
Line	93.86%	93%

[hannahramadan]

fun instance variable setup!

[hannahramadan]

Looks great thank you! For tests that use the new methods ruby_3_4_0_or_above?, do you think we need to add TODO to remove when 3.3 is dropped similar to the code comment or should the code TODO be enough of a remind to go check out the tests

[kaylareopelle]

Looks great thank you! For tests that use the new methods ruby_3_4_0_or_above?, do you think we need to add TODO to remove when 3.3 is dropped similar to the code comment or should the code TODO be enough of a remind to go check out the tests

Great question! If it seems like a TODO would be helpful, I think it's worth including. They're tests that we don't look at often, so I don't think it'd be very bothersome.