Add targetAllocatorFallbackStrategy feature flag

Feature flag available since `v0.114.0` (Add allocation_fallback_strategy option as fallback strategy for per-node strategy [#3482](open-telemetry/opentelemetry-operator#3482))

Author: araiu

charts/opentelemetry-operator/values.yaml

@@ -81,6 +81,7 @@ manager:
   featureGatesMap: {}
     # targetAllocatorMtls: false
     # targetAllocatorCR: false
+    # targetAllocatorFallbackStrategy: false
     # nativeSideCarContainers: false
     # prometheusOperator: false
     # golangFlags: false