fix(test): fix the deterministic kafka source test

[wangrunji0408]

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What's changed and what's your intention?

• Correct the path of kafka.slt.
• Ignore files with invalid name to fix deterministic test: kafka producer panicked at 'called Option::unwrap() on a None value #7633.

Checklist

• I have added necessary unit tests and integration tests
• All checks passed in ./risedev check (or alias, ./risedev c)

Refer to a related PR or issue link (optional)

fix #7633

[codecov]

Codecov Report

Merging #7733 (cfd679a) into main (b6fe18e) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #7733      +/-   ##
==========================================
- Coverage   71.62%   71.62%   -0.01%     
==========================================
  Files        1098     1098              
  Lines      174866   174866              
==========================================
- Hits       125249   125241       -8     
- Misses      49617    49625       +8     

Flag	Coverage Δ
rust	71.62% <ø> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/batch/src/executor/group_top_n.rs	68.23% <0.00%> (-6.48%)	⬇️
src/source/src/row_id.rs	90.90% <0.00%> (-1.14%)	⬇️
...frontend/src/scheduler/hummock_snapshot_manager.rs	60.00% <0.00%> (-0.48%)	⬇️
src/object_store/src/object/mod.rs	51.30% <0.00%> (ø)
src/storage/src/hummock/sstable_store.rs	64.73% <0.00%> (ø)
src/common/src/cache.rs	97.26% <0.00%> (+0.10%)	⬆️
src/common/src/types/ordered_float.rs	31.25% <0.00%> (+0.19%)	⬆️
src/object_store/src/object/mem.rs	87.25% <0.00%> (+0.38%)	⬆️
src/meta/src/hummock/mock_hummock_meta_client.rs	66.31% <0.00%> (+0.52%)	⬆️
...torage/src/hummock/local_version/pinned_version.rs	89.37% <0.00%> (+0.62%)	⬆️

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