Update otelbench changelog and delete changelog fragments. (#705)

Co-authored-by: obltmachine <[email protected]>

Author: elastic-observability-automation[bot]

loadgen/cmd/otelbench/.chloggen/f_add-shuffle-flag.yaml

@@ -4,6 +4,17 @@
 
 <!-- next version -->
 
+## v0.3.0
+
+### 💡 Enhancements 💡
+
+- `otelbench`: Add `-shuffle` flag to randomize the order of benchmarks (#704)
+  Adds a new `-shuffle` flag to randomize the order of benchmarks. This allows concurrent
+  runs to potentially target different signals, allowing multiple signals to be benchmarked
+  at once. For non-concurrent benchmarks, there shouldn't be a significant difference due
+  the execution order.
+  
+
 ## v0.2.2
 
 ### 💡 Enhancements 💡