Improve benchmark unix support (#16702)

* fix configuration case

* make path construction x-platform

* to be consistent

* improve path construction

Author: dawedawe

tests/benchmarks/FCSBenchmarks/CompilerServiceBenchmarks/CompilerServiceBenchmarks.fs

@@ -105,7 +105,8 @@ type CompilerServiceBenchmarks() =
             | Some _ -> configOpt
             | None ->
                 let checker = FSharpChecker.Create(projectCacheSize = 200)
-                let source = FSharpSourceText.From(File.OpenRead("""..\..\..\..\..\..\..\..\..\src\Compiler\Checking\CheckExpressions.fs"""), Encoding.Default, FSharpSourceHashAlgorithm.Sha1, true)
+                let path = __SOURCE_DIRECTORY__ ++ ".." ++ ".." ++ ".." ++ ".." ++ "src" ++ "Compiler" ++ "Checking" ++ "CheckExpressions.fs"
+                let source = FSharpSourceText.From(File.OpenRead(path), Encoding.Default, FSharpSourceHashAlgorithm.Sha1, true)
                 let assemblies = 
                     AppDomain.CurrentDomain.GetAssemblies()
                     |> Array.map (fun x -> x.Location)

tests/benchmarks/SmokeTestBenchmarks.ps1

@@ -9,7 +9,7 @@ function Run {
 
     dotnet run `
         --project $path `
-        -c release `
+        -c Release `
         --no-build `
         --job Dry `
         --allCategories short `

tests/benchmarks/SmokeTestBenchmarks.sh

@@ -6,7 +6,7 @@ run() {
     local path=$1
     dotnet run \
         --project $path \
-        -c release \
+        -c Release \
         --no-build \
         --job Dry \
         --allCategories short \