ci: move internal suite to gitlab

[emmettbutler]

This change moves the internal test suite from circleci to gitlab for billing purposes. There are a handful of tests that fail locally under this new configuration, because I can't figure out how to configure a docker-compose alias for the ddagent service that matches the alias that gitlab seems to require. I think this is an acceptable price to pay for the benefit this change provides.

Checklist

• 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
• The change includes or references documentation updates if necessary
• Backport labels are set (if applicable)

Reviewer Checklist

• 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 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

[github-actions]

CODEOWNERS have been resolved as:

.gitlab/tests/core.yml                                                  @DataDog/python-guild @DataDog/apm-core-python
.circleci/config.templ.yml                                              @DataDog/python-guild @DataDog/apm-core-python
.gitlab-ci.yml                                                          @DataDog/apm-core-python
.gitlab/tests.yml                                                       @DataDog/python-guild @DataDog/apm-core-python
riotfile.py                                                             @DataDog/apm-python
tests/internal/test_serverless.py                                       @DataDog/apm-core-python
tests/telemetry/test_writer.py                                          @DataDog/apm-core-python

[datadog-dd-trace-py-rkomorn]

Datadog Report

Branch report: emmett.butler/internal-gitlab
Commit report: c20664a
Test service: dd-trace-py

✅ 0 Failed, 117907 Passed, 22692 Skipped, 3h 16m 10.73s Total duration (1m 55.19s time saved)

[pr-commenter]

Benchmarks

Benchmark execution time: 2024-08-27 22:16:50

Comparing candidate commit 144b30f in PR branch emmett.butler/internal-gitlab with baseline commit 05b2bbe in branch main.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 214 metrics, 2 unstable metrics.

[emmettbutler]

@erikayasuda @brettlangdon this is reviewable