fix: correctly report the number of remaining tests for io tests - #6263

Overview

This test fixes the reporting of io.test.all where the "number of tests left" increases after each execution instead of decreasing.

Implementation approach and notes

I have changed a foldrM to a foldlM in order to execute the tests in order, and zip with 0.. to get correct indices.

Test coverage

I have added a unit test. I would have liked to introduce a transcripts but this this only shows as transient messages, I don't think that it can (yet) be expressed in a transcript.

I otherwise tested manually:

 ✅  1/10 tests left to run, current test: test6 6
    New test results:

    1. test1    ◉ Passed
    2. test10   ◉ Passed
    3. test2    ◉ Passed
    4. test3    ◉ Passed
    5. test4    ◉ Passed
    6. test6    ◉ Passed
    7. test7    ◉ Passed
    8. test8    ◉ Passed
    9. test9    ◉ Passed

    10. test5   ✗
                elements not equal
                ("ok5", "xxx")


  🚫 1 test(s) failing, ✅ 9 test(s) passing

And I could see the number of tests remaining to execute decrease (note that I added the total number of tests to execute).