Enables parsing of import attributes (the `with` keyword syntax) in the boundaries command by setting `import_attributes: true` in the SWC parser configuration. This was previously fixed for turbo-trace in PR #10078 but was missing from the boundaries module, causing parse errors when encountering syntax like `import x from 'y' with { type: 'json' }`.

Fixes #10961

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Co-Authored-By: Claude <noreply@anthropic.com>

## Summary

Fixes #10961 - Enables parsing of import attributes (the `with` keyword
syntax) in the `turbo boundaries` command.

## Details

The issue was that PR #10078 fixed import attributes parsing for
`turbo-trace` but didn't apply the same fix to the boundaries module.
This caused the boundaries command to fail with "Expected ';', got
'with'" when encountering modern import syntax like:

```js
import pkg from './package.json' with { type: 'json' };
```

## Changes

- Added `import_attributes: true` to the SWC ES syntax configuration in
`crates/turborepo-lib/src/boundaries/mod.rs:437`
- Added test fixture with import attributes to verify the fix works

## Test Plan

- [x] Built the project successfully
- [x] Verified boundaries command now parses files with import
attributes without errors
- [x] Added test fixture file with import attributes that gets checked
by integration tests

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---------

Co-authored-by: Claude <noreply@anthropic.com>