fix: LoggingSpanExporter and LoggingMetricExporter flush() always returns success#8361

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Commits on May 2, 2026

fix: LoggingSpanExporter and LoggingMetricExporter flush() always returns success
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fix: explicitly return Success when flush completes without error
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test: add flush failure coverage for LoggingSpanExporter and LoggingMetricExporter
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