chore(llmobs): make tests runnable outside riot

[Kyle-Verhoog]

The tests shouldn't be dependent on whether they're run from riot or from plain ol' pytest directly.

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:

tests/llmobs/conftest.py                                                @DataDog/ml-observability
tests/llmobs/test_llmobs_eval_metric_writer.py                          @DataDog/ml-observability
tests/llmobs/test_llmobs_span_agentless_writer.py                       @DataDog/ml-observability

[pr-commenter]

Benchmarks

Benchmark execution time: 2024-12-19 19:38:18

Comparing candidate commit bdfbffd in PR branch kylev/llmobs-local-tests with baseline commit 315a48f in branch main.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 208 metrics, 2 unstable metrics.