Refactor traced decorator and remove wrapt import

[AlexandreYang]

What does this PR do?

• Fix wrapt import by using @functools.wraps instead
• Add tests

The issue appeared on CI https://dev.azure.com/datadoghq/integrations-core/_build/results?buildId=7793&view=logs&j=12f53639-7e0c-506b-2b53-a7405df1086b&t=72d0428d-576e-5e1b-640d-0ea2f62b0022

when we upgraded dd-trace: #5491

Motivation

Additional Notes

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• PR title must be written as a CHANGELOG entry (see why)
• Files changes must correspond to the primary purpose of the PR as described in the title (small unrelated changes should have their own PR)
• PR must have changelog/ and integration/ labels attached

[codecov]

Codecov Report

Merging #5586 into master will increase coverage by 0.34%.
The diff coverage is 100%.

Impacted Files	Coverage Δ
...hecks/openstack_controller/openstack_controller.py	74.08% <100%> (ø)
linkerd/tests/conftest.py	61.53% <0%> (ø)	⬆️
kubelet/datadog_checks/kubelet/prometheus.py	80.87% <0%> (ø)	⬆️
postfix/tests/test_integration.py	100% <0%> (ø)	⬆️
istio/datadog_checks/istio/__init__.py	100% <0%> (ø)	⬆️
gearmand/tests/test_integration.py	100% <0%> (ø)	⬆️
...datadog_checks/kube_controller_manager/__init__.py	100% <0%> (ø)	⬆️
go_expvar/tests/test_e2e.py	40% <0%> (ø)	⬆️
...tadog_checks/nginx_ingress_controller/__about__.py	100% <0%> (ø)	⬆️
crio/datadog_checks/crio/__about__.py	100% <0%> (ø)	⬆️
... and 879 more

[brettlangdon]

lgtm

[ofek]

Awesome!!!