Feat: Allow ignoring the classname attribute when calling resolveFileAndLine

[ptsd]

Thanks for a useful action 👍

So the rust runner nextest has a junit quirk...

<testcase name="test_failure" classname="oxidized_navigation::parry3d">
    <failure type="test failure">thread &apos;test_failure&apos; panicked at tests/parry3d.rs:154:5:
assertion `left == right` failed: 0 must equal 1
  left: 0
 right: 1
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace</failure>

This results in all annotations ending up with a file of classname and a line number of 1.

Been a while since I wrote any TS, and have never dived into actions so feel free to suggest a better way.

• Open to suggestions re: naming
• Threading state like this feels yucky but seems to be idiomatic here 🤷

[mikepenz]

Thank you @ptsd for the contribution. I'll try to review as soon as possible.