fix: Fix numaflow-rs binary location in image

[BulkBeing]

This download action was downloading the numaflow-rs-linux-amd64 binary into dist/numaflow-rs-linux-amd64/numaflow-rs-linux-amd64.

- name: Download Rust amd64 binaries
  uses: actions/download-artifact@v3
  with:
    name: numaflow-rs-linux-amd64
    path: dist/numaflow-rs-linux-amd64

This results in the Rust binary to be /bin/numaflow-rs/numaflow-rs-linux-amd64 instead of /bin/numaflow-rs.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.18%. Comparing base (ba40b15) to head (e042ec9).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2050      +/-   ##
==========================================
- Coverage   63.42%   63.18%   -0.24%     
==========================================
  Files         319      319              
  Lines       29171    29171              
==========================================
- Hits        18501    18431      -70     
- Misses       9658     9728      +70     
  Partials     1012     1012              

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