fix(cache): honor custom S3 CA bundles for virtual-hosted endpoints

Summary

• Register Finch pools for virtual-hosted S3 bucket origins so cache requests still use the configured custom CA bundle when S3_VIRTUAL_HOST is enabled.
• Normalize CRLF and escaped newline PEM content before decoding custom S3 CA bundles, which keeps container-injected certificate secrets usable.
• Add focused regression coverage for virtual-hosted bucket pools and escaped-newline PEM bundles.

Testing

• mix test test/tuist_common/finch_pools_test.exs
• mix test test/cache/finch/pools_test.exs

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