feat: show compilation failure as test output

[fredrikaverpil]

fixes #169

Why this change?

• When there's e.g. a compilation error, this is not properly handled. Often the error shown is "Test(s) not associated" which is not very clear.

What was changed?

• Make go list failure show as Neotest test failure.
• Make go test failure show as a Neotest test failure. Supports both go and gotestsum runners.
• Added ability to pass various errors onto the RunSpec context.

Screenshot

Try it out

{
  "fredrikaverpil/neotest-golang",
  branch = "output-on-failure",
},

[fredrikaverpil]

I noticed a problem where this change now introduces a regression where all sub-tests are marked as failed eventhough some of are passing (when executing a top-level test).

I would like to try to address this before merging.

[fredrikaverpil]

I noticed a problem where this change now introduces a regression where all sub-tests are marked as failed eventhough some of are passing (when executing a top-level test).

Ok, I believe I fixed this.