Perf improvement: antiforgery-generation, json

[pr-benchmarks]

Scenario	Environment	Date	Old RPS	New RPS	Change	Deviation	StDev	Dependencies
antiforgery-generation [Fixed]	Antiforgery Token Generation 7- Trends Amd Lin2	08/20/2025 04:08:55	283,149	297,015	4.90 % (13,867) 👍	2.86 σ	4,854.48	Changes Name Version Diff Microsoft.AspNetCore.Antiforgery.dll 10.0.0-rc.2.25416.105 -> 10.0.0-rc.2.25418.112 dotnet/dotnet@a01724d...12f5d74 Microsoft.AspNetCore.App 10.0.0-rc.2.25416.105 -> 10.0.0-rc.2.25418.112 a01724d...12f5d74 Microsoft.NETCore.App 10.0.0-rc.2.25416.105 -> 10.0.0-rc.2.25418.112 dotnet/runtime@a01724d...12f5d74
json	Json 6- Trends Gold Win	08/20/2025 02:01:50	1,349,828	1,415,109	4.84 % (65,281) 👍	3.10 σ	21,082.94	Changes Name Version Diff Microsoft.AspNetCore.Antiforgery.dll 10.0.0-rc.2.25416.105 -> 10.0.0-rc.2.25416.109 dotnet/dotnet@a01724d...7f2a07b Microsoft.AspNetCore.App 10.0.0-rc.2.25416.105 -> 10.0.0-rc.2.25416.109 a01724d...7f2a07b Microsoft.NETCore.App 10.0.0-rc.2.25416.105 -> 10.0.0-rc.2.25416.109 dotnet/runtime@a01724d...7f2a07b

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