More Descriptive Error for TraceQL when querying data that is not supported

[Mkrummz]

Is your feature request related to a problem? Please describe.
when you upgrade to tempo 2.0 the format changes to parquet, but the old blocks remain in the previous format meaning that those blocks aren't available to query using traceql

today this returns a nondescriptive error when trying to query.
the error is "query error upstream: (500) Unsupported"

Describe the solution you'd like
return a more descriptive error outlining you can only query the data that is ingested post upgrade

or add a little info icon that on hover tells you this

[github-actions]

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The next time this stale check runs, the stale label will be removed if there is new activity. The issue will be closed after 15 days if there is no new activity.
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[github-actions]

This issue has been automatically marked as stale because it has not had any activity in the past 60 days.
The next time this stale check runs, the stale label will be removed if there is new activity. The issue will be closed after 15 days if there is no new activity.
Please apply keepalive label to exempt this Issue.