Add Github Actions Reporter as a format

Jest has implemented Github Actions reporter as an output format, which when run in a Github Action, allows Github to then surface test errors alongside the code under review.

Many lint tools have this set up as well, it makes surfacing which tests failed and where they failed just a bit easier.

## Refs:

-
- https://github.com/jestjs/jest/blob/main/packages/jest-reporters/src/GitHubActionsReporter.ts
- https://jestjs.io/blog/2022/04/25/jest-28#github-actions-reporter
- https://github.com/jestjs/jest/pull/11320
- https://github.com/jestjs/jest/issues/10309
- https://github.com/actions/toolkit/blob/master/docs/problem-matchers.md
- Minimal example: https://github.com/stefanbuck/jest-matcher/pull/2/files

Start by reviewing the referenced Jest GitHubActionsReporter.ts implementation, the GitHub Actions problem-matchers documentation, and the minimal example pull request. Determine how gotestsum formats test failures for GitHub Actions, then verify that the new output format surfaces failed tests and locations correctly in a GitHub Actions run.

Written by the indexing model from the issue text.