fix(git): preserve patch output for log -p

[puneetdixit200]

Summary

Fixes #2275.

git log -p asks git for patch output, but the current log path still runs the result through RTK's log summarizer. That treats the diff as commit-body text and drops the patch lines.

This change detects explicit patch-style log flags and sends that command through unchanged, preserving the full diff when the caller asks for it.

Validation

• cargo fmt --all --check
• CARGO_TARGET_DIR=/private/tmp/rtkbuild-2275 cargo test test_log_patch_args_request_passthrough -j1
• CARGO_TARGET_DIR=/private/tmp/rtkbuild-2275 cargo test filter_log_output -j1
• CARGO_TARGET_DIR=/private/tmp/rtkbuild-2275 cargo run --quiet -- git log -p -1 -- src/cmds/git/git.rs
• CARGO_TARGET_DIR=/private/tmp/rtkbuild-2275 cargo test -j1
• CARGO_TARGET_DIR=/private/tmp/rtkbuild-2275 cargo clippy --all-targets -j1

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