Ensure incremental state flag is set when using interned data

The `SEQ_NEEDS_INCREMENTAL_STATE` flag was not being consistently set on trace packets for log messages containing interned data, such as string arguments or stack traces. This could lead to decoding errors when parsing the trace if there was an packet loss leading to the interned values being lost.

Test: atest TracingTests
Flag: EXEMPT minor change
Bug: 424792568
Change-Id: If6415fa15589bc19525e76c5dbfbacb04aff508a