Perf improvement: fortunes_ef, json_middleware

[pr-benchmarks]

Scenario	Environment	Date	Old RPS	New RPS	Change	Deviation	StDev	Dependencies
fortunes_ef [Fixed]	Fortunes Platform EF 8- Trends Database Gold Lin	07/24/2025 19:58:11	589,944	603,664	2.33 % (13,720) 👍	2.12 σ	6,461.83	Changes Name Version Diff Microsoft.AspNetCore.Antiforgery.dll 10.0.0-preview.7.25372.103 -> 10.0.0-preview.7.25373.104 dotnet/dotnet@96ac952...c0e325f Microsoft.AspNetCore.App 10.0.0-preview.7.25372.103 -> 10.0.0-preview.7.25373.104 96ac952...c0e325f Microsoft.NETCore.App 10.0.0-preview.7.25372.103 -> 10.0.0-preview.7.25373.104 dotnet/runtime@96ac952...c0e325f
json_middleware [Fixed]	Json 400k 8- Trends Cobalt Cloud Linux AL3	07/24/2025 12:20:21	4,382	4,386	0.11 % (5) 👍	2.68 σ	1.84	Changes Name Version Diff Microsoft.AspNetCore.Antiforgery.dll 10.0.0-preview.7.25368.105 -> 10.0.0-preview.7.25373.104 dotnet/dotnet@1c92f34...c0e325f Microsoft.AspNetCore.App 10.0.0-preview.7.25368.105 -> 10.0.0-preview.7.25373.104 1c92f34...c0e325f Microsoft.NETCore.App 10.0.0-preview.7.25368.105 -> 10.0.0-preview.7.25373.104 dotnet/runtime@1c92f34...c0e325f

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