Ensure all Haskell test cases still run within same file when there are failed test cases

[donny-wong]

Description:
When running Haskell tests within a file, and there is at least 1 failed tests, all tests fail in the file even though some of them or passing. The issue is If any test case fails, the stack runghc ... command will have an exit status of 1, not 0. This will cause the subprocess.run call to raise an error, because of the check=True argument.

Solution:
A try-except block was used around the subprocess.run call. If the return code is 1 we won't raise an error but will still raise it for other errors.

Testing
Currently markus-autotesting does not have a framework to do unit-testing for Haskell, and due to time, I did not write unit tests for this.

However, to do a manual test, I used a Haskell test file that has 1 passing and 1 failing test case where I named the file Test.hs, with the following contents (note: ".hs" extension file is not supported on GitHub, so I am displaying the contents here.):

module Test where
import Test.QuickCheck

prop_true :: () -> Bool
prop_true _ = True

prop_false :: () -> Bool
prop_false _ = False

It should show 1 passing and 1 failing test in the results after running a test.