Add an experiment named enableLineageRollup which when passed to Java…

[rohitsinha54]

… SDK will make it report Lineage as BoundedTrie

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[rohitsinha54]

R: @robertwb

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[robertwb]

LGTM pending getting the failing tests fixed.

[robertwb]

If !MetricsFlag.lineageRollupEnabled() we should never get here, right? I'd just omit this.

Generally it's also preferable to avoid logic that assumes nothing but lineage would ever use bounded trie.

[rohitsinha54]

The intention was to not emit BTrie at all
https://screenshot.googleplex.com/3aUjctyjdPCueRV

But if we want "avoid logic that assumes nothing but lineage would ever use bounded trie"
Then yes removing it make sense. Done. Thanks.

[rohitsinha54]

This change has been tested by following method:

1. Ran a job without using any flag on 2.64 and the Dataflow job uses StringSet for reporting lineage. Verified it through debug logs and also the type of metric reported to backend. The lineage metrics were successfully processed and sent to Dataplex as lineage graph.
2. Passed --experiments=enableLineageRollup. Same as above. Verified that worker report lineage metrics as BoundedTrie and they were successfully reported to Dataplex as lineage graph.

[rohitsinha54]

This PR depend on #34294

i.e. without the other one on legacy runner jobs cannot emit BoundedTrie so nothing gets reported.

[rohitsinha54]

The tests in two failing suite seem unrelated. Earlier failures in IOs are not fixes in latest run.
@robertwb mind taking another look (third commit) and merge? I will do a force repush to trigger re-run of tests.