test(native): eliminate sleeps and restarts

[jpnurmi]

Use httpserver.wait() context managers and expect_oneshot_request() instead of time.sleep(2) + restart patterns for more reliable and faster test execution.

In busy CI environments, crash processing might exceed 2s. In a fast local development environment, however, it often doesn't take more than a few hundred milliseconds, so unconditional 2s sleeps unnecessarily slow down the test execution. httpserver.wait(timeout=10) combined with expect_oneshot_request() is perfect because it only waits the time it actually takes to receive the request, while being flexible up to 10s if necessary in busy CI environments.

Also, the daemon has a 10s shutdown timeout, which should be enough to flush envelopes in tests, meaning the restarts should not be necessary (famous last words?)

sentry-native/src/backends/native/sentry_crash_context.h

Lines 95 to 96 in 72e1d42

	#define SENTRY_CRASH_TRANSPORT_SHUTDOWN_TIMEOUT_MS \
	10000 // 10 seconds for transport shutdown (increased for TSAN/ASAN builds)

Before, pytest tests/test_integration_native.py took roughly 45s on my Mac. With this, it takes less than 10s.

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