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RequestContext::exportSession() should only export persisted session IDs

Description

RequestContext::exportSession() should only export persisted session IDs

If a non-persisted session ID is exported, then when the session is
reloaded by RequestContext::importScopedSession() the session_start()
will wind up persisting it.

Bug: T124971
Change-Id: If03d130acca6bb98029cfa3cc520cd46f42ff15e