Important

Fix Clippy lint by replacing cloned() with copied() for Copy types in multiple files.

• Lint Configuration:
  • Add cloned_instead_of_copied to Cargo.toml to enforce using copied() instead of cloned() for Copy types.
• Code Changes:
  • Replace cloned() with copied() in tensorzero-core/src/cache.rs for finish_reason.
  • Replace cloned() with copied() in tensorzero-core/src/evaluations/mod.rs for json_mode.
  • Replace cloned() with copied() in tensorzero-core/src/variant/best_of_n_sampling.rs, dicl.rs, and mixture_of_n.rs for json_mode.
  • Replace cloned() with concat() in tensorzero-core/src/variant/mod.rs tests for DUMMY_STREAMING_RESPONSE.
  • Replace cloned() with copied() in tensorzero-core/tests/e2e/providers/batch.rs for inference_ids.
• Misc:
  • Part of issue Enable more pedantic clippy lints #1961 to improve code quality by adhering to Clippy lints.

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