Fix query-frontend conversion of dedicated column blob option (grafana#6377)

* Convert blob option correctly to and from tempopb

* Add CHANGELOG.md entry for blob option fix

Author: stoewer

CHANGELOG.md

@@ -10,6 +10,7 @@
 * [ENHANCEMENT] Double the maximum number of dedicated string columns in vParquet5 and update tempo-cli to determine the optimum number for the data [#6282](https://github.com/grafana/tempo/pull/6282) (@mdisibio)
 * [ENHANCEMENT] Improved live store readiness check and added `readiness_target_lag` and `readiness_max_wait` config parameters. Live store will now - if `readiness_target_lag` is set - not report `/ready` until Kafka lag is brought under the specified value [#6238](https://github.com/grafana/tempo/pull/6238) (@oleg-kozlyuk-grafana)
 * [ENHANCEMENT] Expose a new histogram metric to track the jobs per query distribution [#6343](https://github.com/grafana/tempo/pull/6343) (@javiermolinar)
+* [BUGFIX] Fix query-frontend unable to convert dedicated column blob option [#6377](https://github.com/grafana/tempo/pull/6377) (@stoewer)
 * [BUGFIX] Correct avg_over_time calculation [#6252](https://github.com/grafana/tempo/pull/6252) (@ruslan-mikhailov)
 * [BUGFIX] Correct instant query calculation for rate() [#6205](https://github.com/grafana/tempo/pull/6205) (@ruslan-mikhailov)
 * [BUGFIX] Fix live-store deadlock occurring after a complete block failure [#6338](https://github.com/grafana/tempo/pull/6338) (@ruslan-mikhailov)