Add integration tests for Node

[AbhiPrasad]

Problem Statement

Now that #4260 has merged, we can start adding node integration tests.

Solution Brainstorm

Public API tests

• addBreadcrumb test(node): Add addBreadcrumb integration tests. #4782
• captureException test(node): Add captureException integration tests. #4783
• captureMessage test(node): Add captureMessage integration tests. #4785
• configureScope test(node): Add configureScope integration tests. #4786
• setContext test(node): Add setContext integration tests. #4787
• setExtra test(node): Add setExtra integration tests. #4788
• setExtras test(node): Add setExtras integration tests. #4792
• setTag test(node): Add setTag integration tests. #4793
• setTags test(node): Add setTags integration tests. #4794
• setUser test(node): Add setUser integration tests. #4795
• withScope test(node): Add withScope integration tests. #4796
• flush

Performance

• startTransaction test(node): Document Node integration tests. #4791
• Node Database Auto-instrumentation
  • Mongo test(node): Add integration test for MongoDB auto-instrumentation. #4808
  • MySQL test(node): Add integration test for Postgres auto-instrumentation. #4804
  • Postgres test(node): Add integration test for Postgres auto-instrumentation. #4804

Sessions

• Aggregate Sessions test(node): Add integration tests for aggregated sessions. #4832

Express

• Errors + Performance test(node): Add basic integration tests for Express. #4817

[AbhiPrasad]

As I think we've hit the goals that we want I'm going to close this for now. @onurtemizkan I think we can live with flush test not being here for now, we can always come back to it.