* Refactor test run to separate method

This will allow us to parallelise it more easily
Signed-off-by: Frank Hamand <frankhamand@gmail.com>

* Add --parallel flag to helm test

(No functionality in this commit)
Signed-off-by: Frank Hamand <frankhamand@gmail.com>

* Run helm tests in parallel with --parallel flag
Signed-off-by: Frank Hamand <frankhamand@gmail.com>

* Add a mutex to helm test message streams

This is to protect against data races when running tests in parallel.
Signed-off-by: Frank Hamand <frankhamand@gmail.com>

* Add tests for --parallel flag
Signed-off-by: Frank Hamand <frankhamand@gmail.com>

* Add concurrency limit for parallel helm tests
Signed-off-by: Frank Hamand <frankhamand@gmail.com>

* Add test for concurrency limit
Signed-off-by: Frank Hamand <frankhamand@gmail.com>

* Fix rebase introduced errors
Signed-off-by: Frank Hamand <frankhamand@gmail.com>