chore(ci_visibility): separate pytest outcome processing into its own function

[romainkomorndatadog]

This separates the outcome processing for pytest into a separate function to allow for easier refactoring of code for Early Flake Detection retries.

It also makes the status an optional argument for various finish() calls to allow for finishing without overriding the test status.

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:

ddtrace/contrib/pytest/_plugin_v2.py                                    @DataDog/ci-app-libraries
ddtrace/internal/ci_visibility/api/_test.py                             @DataDog/ci-app-libraries
ddtrace/internal/test_visibility/api.py                                 @DataDog/ci-app-libraries
static-analysis.datadog.yml                                             @DataDog/apm-core-python

[pr-commenter]

Benchmarks

Benchmark execution time: 2024-10-07 13:59:12

Comparing candidate commit cd10cf5 in PR branch romain.komorn/SDTEST-869/separate_outcome_processing with baseline commit 6ae8477 in branch main.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 367 metrics, 53 unstable metrics.