ci: enable clippy::default_trait_access lint

[poyrazK]

Summary

• Enable clippy::default_trait_access lint in CI
• Fix 94 warnings by replacing Default::default() with IndexSettings::default() or MappingMode::default()
• Add MappingMode import where missing

Test plan

• CI passes with new lint enabled
• All warnings fixed

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 6e4734a4-40fc-46de-b187-55b5aa52b9ac

📥 Commits

Reviewing files that changed from the base of the PR and between 0b6e8ec and 965a592.

📒 Files selected for processing (8)

• .github/workflows/ci.yml
• rust/crates/cloudsearch-api/src/lib.rs
• rust/crates/cloudsearch-api/tests/bulk.rs
• rust/crates/cloudsearch-api/tests/metrics.rs
• rust/crates/cloudsearch-api/tests/query_parsing.rs
• rust/crates/cloudsearch-api/tests/slow_query.rs
• rust/crates/cloudsearch-index/src/lib.rs
• rust/crates/cloudsearch-index/tests/coverage.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/default-trait-access-lint

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[poyrazK]

It's okay to merge