ci: include missing release steps [backport 2.11] (#10402)

Backport e1a8457 from #10359 to 2.11.

Must have messed up a merge conflict and didn't end up keeping this in
the config.

## Checklist
- [x] PR author has checked that all the criteria below are met
- The PR description includes an overview of the change
- The PR description articulates the motivation for the change
- The change includes tests OR the PR description describes a testing
strategy
- The PR description notes risks associated with the change, if any
- Newly-added code is easy to change
- The change follows the [library release note
guidelines](https://ddtrace.readthedocs.io/en/stable/releasenotes.html)
- The change includes or references documentation updates if necessary
- Backport labels are set (if
[applicable](https://ddtrace.readthedocs.io/en/latest/contributing.html#backporting))

## Reviewer Checklist
- [x] Reviewer has checked that all the criteria below are met 
- Title is accurate
- All changes are related to the pull request's stated goal
- Avoids breaking
[API](https://ddtrace.readthedocs.io/en/stable/versioning.html#interfaces)
changes
- Testing strategy adequately addresses listed risks
- Newly-added code is easy to change
- Release note makes sense to a user of the library
- If necessary, author has acknowledged and discussed the performance
implications of this PR as reported in the benchmarks PR comment
- 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)

Co-authored-by: Brett Langdon <[email protected]>

.gitlab-ci.yml

@@ -13,6 +13,7 @@ include:
   - local: ".gitlab/benchmarks.yml"
   - local: ".gitlab/macrobenchmarks.yml"
   - local: ".gitlab/dogfood.yml"
+  - local: ".gitlab/release.yml"
 
 variables:
   REPO_LANG: python # "python" is used everywhere rather than "py"

.gitlab/release.yml

@@ -30,7 +30,7 @@ variables:
 
 release_pypi_test:
   extends: .release_pypi
-  dependencies: [ "download_ddtrace_wheels" ]
+  dependencies: [ "download_ddtrace_artifacts" ]
   variables:
     PYPI_REPOSITORY: testpypi