fix(itr): add skipped test check for coverage [backport 2.2] (#7609)

Backport 699adfa from #7604 to 2.2.

## What does this PR do?

This PR ensures that code coverage for ITR won't be enabled if it is a
skipped `unittest` test.

## Checklist

- [X] Change(s) are motivated and described in the PR description.
- [X] Testing strategy is described if automated tests are not included
in the PR.
- [X] Risk is outlined (performance impact, potential for breakage,
maintainability, etc).
- [X] Change is maintainable (easy to change, telemetry, documentation).
- [X] [Library release note
guidelines](https://ddtrace.readthedocs.io/en/stable/releasenotes.html)
are followed. If no release note is required, add label
`changelog/no-changelog`.
- [X] Documentation is included (in-code, generated user docs, [public
corp docs](https://github.com/DataDog/documentation/)).
- [X] Backport labels are set (if
[applicable](https://ddtrace.readthedocs.io/en/latest/contributing.html#backporting))

## Reviewer Checklist

- [x] Title is accurate.
- [x] No unnecessary changes are introduced.
- [x] Description motivates each change.
- [x] Avoids breaking
[API](https://ddtrace.readthedocs.io/en/stable/versioning.html#interfaces)
changes unless absolutely necessary.
- [x] Testing strategy adequately addresses listed risk(s).
- [x] Change is maintainable (easy to change, telemetry, documentation).
- [x] Release note makes sense to a user of the library.
- [x] Reviewer has explicitly acknowledged and discussed the performance
implications of this PR as reported in the benchmarks PR comment.
- [x] Backport labels are set in a manner that is consistent with the
[release branch maintenance
policy](https://ddtrace.readthedocs.io/en/latest/contributing.html#backporting)
- [x] If this PR touches code that signs or publishes builds or
packages, or handles credentials of any kind, I've requested a review
from `@DataDog/security-design-and-guidance`.
- [x] This PR doesn't touch any of that.

Co-authored-by: Eric Navarro <[email protected]>

Author: github-actions[bot]

ddtrace/contrib/unittest/patch.py

@@ -601,7 +601,7 @@ def handle_test_wrapper(func, instance, args: tuple, kwargs: dict):
                 )
                 result.stopTest(test=instance)
             else:
-                if _CIVisibility._instance._collect_coverage_enabled:
+                if _is_test_coverage_enabled(instance):
                     coverage = _start_coverage(root_directory)
                     instance._coverage = coverage
                 result = func(*args, **kwargs)