Fix intuitive path behavior for sourcemaps

[szokeasaurusrex]

Description

The --ignore option for sourcemaps upload and sourcemaps inject commands now interprets patterns relative to the current working directory (CWD) for more intuitive behavior. Previously, patterns were matched relative to each individual search path.

This change was implemented by switching from ignore::overrides::OverrideBuilder to WalkBuilder::filter_entry with glob::Pattern for pattern matching. The help text for the --ignore option has been updated to reflect this new behavior. New integration tests have been added to verify the CWD-relative ignore functionality.

This is a v3.0 breaking change; users relying on the old behavior will need to update their ignore patterns.

Issues

No specific issue ID was provided for this task.

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[cursor]

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## Unreleased

### Fixes

- Fix intuitive path behavior for sourcemaps ([#2979](https://github.com/getsentry/sentry-cli/pull/2979))

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[szokeasaurusrex]

I think we will want to go with a different approach: using walkdir instead of ignore.