[Feature Request]: Pull diff coverage report from CI artifact

### Feature description

Hi - thanks for providing this action!

Would you accept a PR for a feature where the coverage report for comparison is retrieved from a CI artifact instead of a storage branch?

I was thinking along the lines of something like:

```yaml
- name: Produce the coverage report
uses: insightsengineering/coverage-action@v3
with:
diff-branch: main
diff-workflow: run-tests
diff-artifact: coverage-*
```

Where if specified the latest run of `diff-workflow` for `diff-branch` is checked for an artifact matching `coverage-*` to use for comparison.

The default for `diff-workflow` would be the empty string in which case `diff-storage` is used.

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