[tobias-tengler]

Apollo Federation lookups for the same entity at the same dependency depth are sent as a separate _entities operation per target path, even when they are structurally identical. For the apollo-federation benchmark query this means 13 subgraph operations across the 7 HTTP requests, with the same representations sent several times.

This PR merges structurally identical Apollo lookups (same source schema, entity type, requirements, selections and dependency depth) into one multi-target lookup with one deduplicated representation list, as the planner already does for composite-schema lookups. Lookups at the same schema and depth already share a request batch, so the merge adds no waits and no selections to any lookup. OperationPlanner.Version goes to 2.3.0 and the operation plan JSON format to 1.2.0, since ApolloOperationBatch entries can now carry targets.

Benchmark query	Version	HTTP requests	Subgraph operations
apollo-federation	main	7	13
apollo-federation	PR	7	8

[github-actions]

Patch coverage

78.8% of changed lines covered (313/397)

File	Covered	Changed	Patch %
…/Execution/Nodes/ApolloOperationExecutionNode.cs	0	1	0.0% 🔴
…/Fusion/src/Fusion.Execution/Execution/ThrowHelper.cs	0	3	0.0% 🔴
…/src/Fusion.Execution/Execution/OperationPlanContext.cs	13	26	50.0% 🔴
…/Execution/Nodes/ApolloOperationBatchExecutionNode.cs	99	151	65.6% 🔴
…/Execution/Results/FetchResultStore.RepresentationValue.cs	26	30	86.7% 🟡
…/Planning/OperationPlanner.BuildExecutionTree.cs	116	127	91.3% 🟡
…/Execution/Nodes/Serialization/JsonOperationPlanFormatter.cs	12	12	100.0% 🟢
…/Execution/Nodes/Serialization/JsonOperationPlanParser.cs	35	35	100.0% 🟢
…/Execution/Nodes/Serialization/YamlOperationPlanFormatter.cs	11	11	100.0% 🟢
…/Fusion/src/Fusion.Execution/Planning/OperationPlanner.cs	1	1	100.0% 🟢

Uncovered changed lines (JSON)

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  "sha": "28ff71390a02bb201ae1aba6d872c9c24d78670e",
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  ]
}

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Project coverage: 59.1% (313178/529511 lines)

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