tests on windows run faster when run as admin

I'm seeing some pretty sizeable changes in perf when running tests as admin. Not sure why just yet.

### Run under my normal user account

BenchmarkDotNet=v0.13.1.1694-nightly, OS=Windows 11 (10.0.22000.493/21H2)
Intel Core i7-8700 CPU 3.20GHz (Coffee Lake), 1 CPU, 12 logical and 6 physical cores
.NET SDK=7.0.100-alpha.1.21568.2
[Host] : .NET 6.0.2 (6.0.222.6406), X64 RyuJIT
Job-MJNEMQ : .NET 7.0.0 (42.42.42.42424), X64 RyuJIT
Job-TCPSLQ : .NET 7.0.0 (42.42.42.42424), X64 RyuJIT

PowerPlanMode=00000000-0000-0000-0000-000000000000 Arguments=/p:DebugType=portable,-bl:benchmarkdotnet.binlog IterationTime=250.0000 ms
MaxIterationCount=40 MinIterationCount=15 WarmupCount=1

| Method | Job | Toolchain | Mean | Error | StdDev | Median | Min | Max | Ratio | RatioSD | Allocated | Alloc Ratio |
|--------------- |----------- |---------------------------------------------------------------------------------- |---------:|----------:|----------:|---------:|----------:|---------:|------:|--------:|----------:|------------:|
| SpectralNorm_3 | Job-MJNEMQ | \runtime0\artifacts\tests\coreclr\windows.x64.Release\Tests\Core_Root\corerun.exe | 3.211 ms | 0.3935 ms | 0.6994 ms | 3.495 ms | 0.7539 ms | 3.627 ms | 1.28 | 0.83 | 5.29 KB | 1.01 |
| SpectralNorm_3 | Job-TCPSLQ | \runtime1\artifacts\tests\coreclr\windows.x64.Release\Tests\Core_Root\corerun.exe | 2.923 ms | 0.4708 ms | 0.8368 ms | 3.396 ms | 0.7014 ms | 3.513 ms | 1.00 | 0.00 | 5.24 KB | 1.00 |

### Run as admin

BenchmarkDotNet=v0.13.1.1694-nightly, OS=Windows 11 (10.0.22000.493/21H2)
Intel Core i7-8700 CPU 3.20GHz (Coffee Lake), 1 CPU, 12 logical and 6 physical cores
.NET SDK=7.0.100-alpha.1.21568.2
[Host] : .NET 6.0.2 (6.0.222.6406), X64 RyuJIT
Job-HAOWJK : .NET 7.0.0 (42.42.42.42424), X64 RyuJIT
Job-KLTELT : .NET 7.0.0 (42.42.42.42424), X64 RyuJIT

PowerPlanMode=00000000-0000-0000-0000-000000000000 Arguments=/p:DebugType=portable,-bl:benchmarkdotnet.binlog IterationTime=250.0000 ms
MaxIterationCount=40 MinIterationCount=15 WarmupCount=1

| Method | Job | Toolchain | Mean | Error | StdDev | Median | Min | Max | Ratio | RatioSD | Allocated | Alloc Ratio |
|--------------- |----------- |---------------------------------------------------------------------------------- |---------:|----------:|----------:|---------:|---------:|---------:|------:|--------:|----------:|------------:|
| SpectralNorm_3 | Job-HAOWJK | \runtime0\artifacts\tests\coreclr\windows.x64.Release\Tests\Core_Root\corerun.exe | 2.006 ms | 0.0923 ms | 0.1592 ms | 2.051 ms | 1.401 ms | 2.181 ms | 0.98 | 0.10 | 5.29 KB | 1.00 |
| SpectralNorm_3 | Job-KLTELT | \runtime1\artifacts\tests\coreclr\windows.x64.Release\Tests\Core_Root\corerun.exe | 2.064 ms | 0.0657 ms | 0.1167 ms | 2.079 ms | 1.759 ms | 2.256 ms | 1.00 | 0.00 | 5.27 KB | 1.00 |