* pkg/tsdb/parca: Upgrade to using the flamegraph arrow
* pkg/tsdb/parca: Delete code for old flamegraphs
* pkg/tsdb/parca: Fix golangci-lint error in test
* pkg/tsdb/parca: Handle errors nicely
* docs/sources/datasource: Add Parca v0.19+ support note
* pkg/tsdb/parca: Don't use arrow table reader
As pointed out during reviews, it's not really needed and we can read the record directly.