smoke_test: Run git commit to work around cargo bug

[Turbo87]

This is a workaround for rust-lang/cargo#14354, which currently prevents us from running our smoke tests.

cargo currently (Rust 1.81) crashes when cargo publish (or cargo package) is used on a git repository that has no commits yet. Since that is the setup we had been using for our smoke tests we are currently running into this issue. The solution in this PR runs git add --all and git commit as part of creating our dummy project, which resolves the problem on our end. As a nice bonus, this allows us to remove the --allow-dirty argument from the cargo publish call, since we have now committed all of our changes.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 54 lines in your changes missing coverage. Please review.

Project coverage is 89.14%. Comparing base (3672ffa) to head (334ee11).
Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/crates_io_smoke_test/src/main.rs	0.00%	25 Missing ⚠️
crates/crates_io_smoke_test/src/git.rs	0.00%	18 Missing ⚠️
crates/crates_io_smoke_test/src/cargo.rs	0.00%	11 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9405      +/-   ##
==========================================
- Coverage   89.27%   89.14%   -0.13%     
==========================================
  Files         284      285       +1     
  Lines       28872    28914      +42     
==========================================
  Hits        25775    25775              
- Misses       3097     3139      +42     

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