ci: fix Diamond Storage Check artifact upload

[energypantry]

Fixes #992.

The Diamond Storage Check workflow was failing with an invalid artifact name error (artifact name generated from branch + contract path).

This PR switches the workflow to a patched foundry-storage-check action revision that:

• Sanitizes + shortens artifact names deterministically (branch slug + hash)
• Avoids failing PRs when the base branch report artifact is not present yet (warn + skip compare)

Action ref used: energypantry/foundry-storage-check@fb95d25056453a7d61643f411ab2b3acaea33a39.

If you prefer keeping the action under the ubiquity org, I can open the corresponding upstream PR (same commits) to ubiquity/foundry-storage-check and then we can repin to that ref.

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[energypantry]

All checks are green now. @rndquu when you have a moment, could you please review/merge this fix for the Diamond Storage Check artifact-name failure? Thanks.

[energypantry]

Quick follow-up: all checks are green on this PR. When you have a moment, could you please review/merge the CI fix so Diamond Storage Check stops failing on PRs? Thanks. cc @rndquu

[energypantry]

@rndquu Could you take a quick Codeowner look on this PR when you have a moment?

All checks are green and it's ready to merge once the requested review is in. Happy to tweak anything you spot.