test: add RustFS e2e integration harness

[GatewayJ]

Type of Change

• New Feature
• Bug Fix
• Documentation
• Performance Improvement
• Test/CI
• Refactor
• Other: N/A

Related Issues

N/A

Summary of Changes

• Add a dedicated Rust e2e crate with a reusable framework for kind, kubectl, artifact collection, image loading, storage provisioning, and tenant setup.
• Add smoke, operator, console, and fault scenario coverage for the RustFS Operator e2e workflow.
• Add Makefile and script-test targets for running, listing, and cleaning the e2e harness.
• Document local prerequisites and usage in e2e/README.md.

Checklist

• I have read and followed the CONTRIBUTING.md guidelines
• Passed make pre-commit (fmt-check + clippy + test + console-lint + console-fmt-check)
• Added/updated necessary tests
• Documentation updated (if needed)
• CHANGELOG.md updated under [Unreleased] (if user-visible change; N/A for this e2e harness)
• CI/CD passed (if applicable; pending GitHub Actions)

Impact

• Breaking change (CRD/API compatibility)
• Requires doc/config/deployment update: adds e2e harness documentation and kind manifest
• Other impact: N/A

Verification

make pre-commit

Additional Notes

N/A

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Thank you for your contribution! Please ensure your PR follows the community standards (CODE_OF_CONDUCT.md) and sign the CLA if this is your first contribution.

[GatewayJ]

Closing in favor of #121. This first PR was opened from a branch that still contained a squash-equivalent upstream commit from #118, so GitHub marked it conflicting.