fix(flare): handle non-dict AGENT_CONFIG products from RC

[erikayasuda]

Tracer flares were failing due to AGENT_CONFIG items possibly containing pure booleans, and not just dictionaries. Example:

AGENT_CONFIG=[True, {...config...}, ...]

This would break the flare because it would be expecting only dicts.

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:

releasenotes/notes/fix-tracer-flare-e4003d01b434267a.yaml               @DataDog/apm-python
ddtrace/internal/flare/_subscribers.py                                  @DataDog/apm-core-python
ddtrace/internal/flare/flare.py                                         @DataDog/apm-core-python
ddtrace/internal/flare/handler.py                                       @DataDog/apm-core-python
tests/internal/test_tracer_flare.py                                     @DataDog/apm-core-python

[datadog-dd-trace-py-rkomorn]

Datadog Report

Branch report: erikayasuda/tracerflare-fix
Commit report: 8fa9ba0
Test service: dd-trace-py

✅ 0 Failed, 1084 Passed, 202 Skipped, 26m 55.33s Total duration (10m 9.83s time saved)

[pr-commenter]

Benchmarks

Benchmark execution time: 2024-10-17 16:51:20

Comparing candidate commit 8fa9ba0 in PR branch erikayasuda/tracerflare-fix with baseline commit db9c3ec in branch main.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 365 metrics, 53 unstable metrics.