Use span attrs in GCP sampling context

[sentrivana]

• add initial span attrs and get rid of custom sampling context
• add one extra span attr to aws too
• update tests

[codecov]

❌ 885 Tests Failed:

Tests completed	Failed	Passed	Skipped
19529	885	18644	4424

View the top 3 failed tests by shortest run time

tests.integrations.opentelemetry.test_span_processor test_on_start_transaction

Stack Traces | 0.001s run time

.../integrations/opentelemetry/test_span_processor.py:289: in test_on_start_transaction
    fake_start_transaction,
.../hostedtoolcache/Python/3.7.17....../x64/lib/python3.7/unittest/mock.py:1307: in __enter__
    original, local = self.get_original()
.../hostedtoolcache/Python/3.7.17....../x64/lib/python3.7/unittest/mock.py:1281: in get_original
    "%s does not have the attribute %r" % (target, name)
E   AttributeError: <module 'sentry_sdk.integrations.opentelemetry.span_processor' from '.../integrations/opentelemetry/span_processor.py'> does not have the attribute 'start_transaction'

tests.integrations.opentelemetry.test_span_processor test_on_start_transaction

Stack Traces | 0.001s run time

.../integrations/opentelemetry/test_span_processor.py:289: in test_on_start_transaction
    fake_start_transaction,
.../hostedtoolcache/Python/3.7.17....../x64/lib/python3.7/unittest/mock.py:1307: in __enter__
    original, local = self.get_original()
.../hostedtoolcache/Python/3.7.17....../x64/lib/python3.7/unittest/mock.py:1281: in get_original
    "%s does not have the attribute %r" % (target, name)
E   AttributeError: <module 'sentry_sdk.integrations.opentelemetry.span_processor' from '.../integrations/opentelemetry/span_processor.py'> does not have the attribute 'start_transaction'

tests.integrations.opentelemetry.test_span_processor test_on_start_transaction

Stack Traces | 0.002s run time

.../integrations/opentelemetry/test_span_processor.py:287: in test_on_start_transaction
    with mock.patch(
.../hostedtoolcache/Python/3.12.7....../x64/lib/python3.12/unittest/mock.py:1463: in __enter__
    original, local = self.get_original()
.../hostedtoolcache/Python/3.12.7....../x64/lib/python3.12/unittest/mock.py:1436: in get_original
    raise AttributeError(
E   AttributeError: <module 'sentry_sdk.integrations.opentelemetry.span_processor' from '.../integrations/opentelemetry/span_processor.py'> does not have the attribute 'start_transaction'

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