Changing JIT perf test names to fix how they are organized on BenchView (#8083)

Changing JIT perf test names to fix how they are organized on BenchView (#8083)

* Changing JIT performance tests' names to fix how tests are organized on BenchView.

* Adding changes based on PR suggestions.
- Add double quotes on cmd script
- Keep name casing consistent for the Benchstone benchmarks.

* Updating datacontractxml value to match new class name.

* Removing an extra / on the xmlns string.

* Making sure we are getting latest BenchView tools.
- Changed where BenchView tools are installed to (from C:\tools to %WORKSPACE%)
- Check if the tools already exist, if so, delete them and download them again.