Dual POTel setup improvements

[sentrivana]

• If a TracerProvider already exists, patch it. TracerProvider is a singleton, so if we aren't the first one setting it up, we need to use the existing one.
  • In tests, reset TracerProvider after each test so that we start with a clean slate and it gets set up anew on init.
• If an OTel span starts, record its instrumentation_scope.name (e.g. opentelemetry.instrumentation.flask) and turn it into origin at the end. This allows us to differentiate between spans auto-instrumented by Sentry and OTel.

[codecov]

⚠️ Parser warning

The parser emitted a warning. Please review your JUnit XML file:

Warning while parsing testcase attributes: Limit of string is 1000 chars, for name, we got 2301 at 1:2560 in /home/runner/work/sentry-python/sentry-python/.junitxml

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❌ 52 Tests Failed:

Tests completed	Failed	Passed	Skipped
20186	52	20134	4417

View the top 3 failed test(s) by shortest run time

tests.opentelemetry.test_potel::test_root_span_transaction_payload_started_with_otel_only

Stack Traces | 0.081s run time

tests/opentelemetry/test_potel.py:45: in test_root_span_transaction_payload_started_with_otel_only
    assert trace_context["origin"] == "manual"
E   AssertionError: assert 'tests.opentelemetry.test_potel' == 'manual'
E     
E     - manual
E     + tests.opentelemetry.test_potel

tests.opentelemetry.test_potel::test_child_span_payload_started_with_otel_only

Stack Traces | 0.082s run time

tests/opentelemetry/test_potel.py:65: in test_child_span_payload_started_with_otel_only
    assert span["origin"] == "manual"
E   AssertionError: assert 'tests.opentelemetry.test_potel' == 'manual'
E     
E     - manual
E     + tests.opentelemetry.test_potel

tests.opentelemetry.test_potel::test_child_span_payload_started_with_otel_only

Stack Traces | 0.088s run time

tests/opentelemetry/test_potel.py:65: in test_child_span_payload_started_with_otel_only
    assert span["origin"] == "manual"
E   AssertionError: assert 'tests.opentelemetry.test_potel' == 'manual'
E     - manual
E     + tests.opentelemetry.test_potel

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