Infrastructure changes to improve efficiency when developing performance tests.

- Performance experiment test build runs on any linux agent
- Not all performance experiment tests run as part of performance test suite
- Allow ad hoc performance (experiment) test to be run on any (linux) agent

Changes to improve efficiency of Gradle developers who are using or improving the performance test infrastructure, while working on performance improvements.

## Potential changes

- Performance experiment test build runs on any linux agent. This means that the performance experiment builds will not be blocked waiting
  for the long running performance tests to complete.
- Not all performance experiment tests run as part of performance test suite. This allows experiments to be used while working on a particular improvements.
  It also allows performance tests to be developed without breaking the performance test suite.
- Allow ad hoc performance (experiment) test to be run on any agent, including Windows agents. This allows results to be gathered without blocking the developer's 
  machine.

Clean up the words for 'more efficient performance experiments'
Clean up the words for 'more efficient performance experiments'
