Remove the custom hardcode (which isn't valid on every machine), the base test nuget restore can find the common folder without additional help now.

Issue: RSRP-502680
Source: d5ed997d3908c7415f8a77fe95321f4cae29ce24
Branch: "h.RSRP-502680.Take-JetEnvironment-Init-Off-the-Main-Thread"

GitOrigin-RevId: ff08d4d427b1c8e4060c7a1c73f668675a6d4df7

Author: hypersw

ReSharper.FSharp/test/data/TestAssembliesSources/nuget.config

@@ -1,8 +1,5 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <configuration>
-  <config>
-    <add key="repositoryPath" value="C:\temp\JetTestPackages" />
-  </config>
   <packageSources>
     <clear />
     <add key="resharper-platform" value="https://resharper-platform.jetbrains.com/api/v2/" />

ReSharper.FSharp/test/data/nuget.config

@@ -1,8 +1,5 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <configuration>
-  <config>
-    <add key="repositoryPath" value="C:\temp\JetTestPackages" />
-  </config>
   <packageSources>
     <clear />
     <add key="resharper-platform" value="https://resharper-platform.jetbrains.com/api/v2/" />