Persist static file CLI config

[decofe]

Summary

• persist static file CLI overrides into reth.toml during node config loading
• keep CLI values taking precedence over TOML values before building the static file provider
• add a regression test for saving static-files.blocks-per-file.headers

Testing

• cargo test -p reth-node-builder launch::common::tests::test_save_static_files_config
• cargo fmt --check reports pre-existing repo-wide stable-rustfmt diffs unrelated to this patch

Prompted by: @joshieDo

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