Skip external issue in lfs file fetching test

[robaiken]

What are you trying to accomplish?

Skipping LFS test due to external issue

Anything you want to highlight for special attention from reviewers?

The test is failing because the external test repository dependabot-fixtures/dependabot-yarn-lfs-fixture has exceeded its GitHub LFS budget/quota.

How will you know you've accomplished your goal?

Test will be skipped, unblocking npm ecosystem deployments

Checklist

• I have run the complete test suite to ensure all tests and linters pass.
• I have thoroughly tested my code changes to ensure they work as expected, including adding additional tests for new functionality.
• I have written clear and descriptive commit messages.
• I have provided a detailed description of the changes in the pull request, including the problem it addresses, how it fixes the problem, and any relevant details about the implementation.
• I have ensured that the code is well-documented and easy to understand.