`sourcemaps inject` should fall back to co-located source maps if exact path can't be found

[brettdh]

Environment

What version of the CLI and what OS are you running?

Sentry CLI 1.23.0, macOS Ventura 13.4

Steps to Reproduce

Similar to #1846:

1. Create a .js file with a corresponding .js.map file in the same directory
2. Add a source map comment pointing to a path that doesn't exist locally; e.g.

   //# sourceMappingURL=/_static/build/foo.js.map
   

   Note: this is a mostly-real example from a starter Remix app. The path here is the default when creating a new app from the grunge stack, but this issue will occur for any static assets path, whether or not it has a URL scheme and domain.
3. Run sentry-cli sourcemaps inject foo.js*

Alternatively, though it was created to repro a different bug, you can also repro this bug by following the steps here, ignoring the AWS bits and running npm run build instead of any of the other scripts. The sentry-cli sourcemaps inject step will show missing debug IDs for the sourcemap files.

Expected Result

JS file and sourcemap file both have debug ID injected

Actual Result

Only JS file has debug ID injected

Logs

When filing a bug report, please attach debug logs, either by using --log-level=debug flag or SENTRY_LOG_LEVEL=debug environment variable.

[adinauer]

@brettdh thanks for opening this issue. Might take a while for us to look at it with the holidays coming up.

[brettdh]

Should have mentioned - I'm working on a PR already, as it's a trivial addition to my last one.