ci: optimize ci runtime [backport 2.19]

[erikayasuda]

Manual backport for #11798 into 2.19

• Remove redundant build_base_venvs
  • not needed by any downstream jobs, we have to re-do this in the tests-gen pipeline anyways
• Move conftest hatch job from precheck to hatch stage
  • hatch jobs that have to install dev take a long time to run 6+ mins
• Remove redundant .testrunner definition, and need for injecting services.yml into tests.yml template

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/package.yml                                                     @DataDog/python-guild @DataDog/apm-core-python
.gitlab/tests.yml                                                       @DataDog/python-guild @DataDog/apm-core-python
hatch.toml                                                              @DataDog/python-guild
scripts/gen_gitlab_config.py                                            @DataDog/apm-core-python
tests/suitespec.yml                                                     @DataDog/python-guild @DataDog/apm-core-python

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-01-16 01:11:34

Comparing candidate commit e9680ef in PR branch backport-11798-to-2.19 with baseline commit e16d68c in branch 2.19.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 394 metrics, 2 unstable metrics.