Re-enable `devtools_tests`

[elliette]

The devtools_tests have been disabled for various reasons:

1. Timing out after 5 minutes: Fix flaky CI tests #1848
2. The streamCpuSamplesWithUserTag method is erroneously being called from DWDS  #1504
3. Re-enable debug extension tests on Windows #1724

This tracks the work to re-enable all the devtools test cases.