chore(tracing): ensure tracing tests do not initialize the tracer

[mabdinur]

Follow up to: #11823

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/ci_visibility/test_ci_visibility.py                               @DataDog/ci-app-libraries
tests/ci_visibility/util.py                                             @DataDog/ci-app-libraries
tests/commands/ddtrace_run_app_name.py                                  @DataDog/apm-core-python
tests/contrib/aiomysql/test_aiomysql.py                                 @DataDog/apm-core-python @DataDog/apm-idm-python
tests/contrib/flask_cache/test_utils.py                                 @DataDog/apm-core-python @DataDog/apm-idm-python
tests/contrib/kafka/test_kafka.py                                       @DataDog/apm-core-python @DataDog/apm-idm-python
tests/contrib/tornado/test_config.py                                    @DataDog/apm-core-python @DataDog/apm-idm-python
tests/integration/test_debug.py                                         @DataDog/apm-core-python
tests/integration/test_encoding.py                                      @DataDog/apm-core-python
tests/integration/test_integration.py                                   @DataDog/apm-core-python
tests/integration/test_integration_civisibility.py                      @DataDog/ci-app-libraries
tests/integration/test_integration_snapshots.py                         @DataDog/apm-core-python
tests/integration/test_priority_sampling.py                             @DataDog/apm-sdk-api-python
tests/integration/test_propagation.py                                   @DataDog/apm-sdk-api-python
tests/integration/test_trace_stats.py                                   @DataDog/apm-core-python
tests/integration/utils.py                                              @DataDog/apm-core-python
tests/opentracer/core/test_dd_compatibility.py                          @DataDog/apm-core-python
tests/opentracer/core/test_span.py                                      @DataDog/apm-core-python
tests/opentracer/core/test_tracer.py                                    @DataDog/apm-core-python
tests/opentracer/utils.py                                               @DataDog/apm-core-python
tests/profiling/collector/conftest.py                                   @DataDog/profiling-python
tests/profiling/test_profiler.py                                        @DataDog/profiling-python
tests/profiling_v2/collector/conftest.py                                @DataDog/profiling-python
tests/telemetry/test_telemetry_metrics_e2e.py                           @DataDog/apm-python
tests/tracer/test_correlation_log_context.py                            @DataDog/apm-sdk-api-python
tests/tracer/test_gitmetadata.py                                        @DataDog/apm-sdk-api-python
tests/tracer/test_memory_leak.py                                        @DataDog/apm-sdk-api-python
tests/tracer/test_processors.py                                         @DataDog/apm-sdk-api-python
tests/tracer/test_single_span_sampling_rules.py                         @DataDog/apm-sdk-api-python
tests/tracer/test_trace_utils.py                                        @DataDog/apm-sdk-api-python
tests/tracer/test_tracer.py                                             @DataDog/apm-sdk-api-python
tests/utils.py                                                          @DataDog/python-guild

[pr-commenter]

Benchmarks

Benchmark execution time: 2024-12-20 21:48:09

Comparing candidate commit 6ba7664 in PR branch munir/update-tests-to-respect-t-singletons with baseline commit 728a816 in branch munir/make-tracer-a-singleton.

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