Fix improper read of intent EXTRA

This fixes a bug with our metrics logging. We were improperly reading EXTRA_SESSION_ID from the intent, which was defaulting to 0. The sessionId is used to correlate logging across intent boundaries, so we need to read the value being passed properly.

Bug: 278972748
Test: atest CtsPermission3TestCases:SafetyLabelChangesJobServiceTest
Change-Id: I41345864d700b19b5c93e0f4994c6fc3f35ef6e5