fix: return empty list for VASP forward_common_files to prevent upload errors

[Copilot]

This PR fixes a critical issue where dpgen autotest run would fail with RuntimeError: cannot find upload file when using VASP as the DFT calculator.

Problem

When running dpgen autotest run relax.json machine.json with VASP configuration, users encountered:

RuntimeError: cannot find upload file /home/user/project/autotest/dft INCAR_

This error occurred because:

1. VASP's forward_common_files() method returned ["INCAR", "POTCAR"]
2. dpdispatcher tried to upload these "common" files from the work_path directory
3. However, VASP actually creates these files per-task in subdirectories (e.g., confs/ZrO2-m/relaxation/) and symlinks them to task directories
4. The files don't exist in the work_path, causing the upload to fail

Solution

Modified VASP.forward_common_files() to return an empty list [] instead of ["INCAR", "POTCAR"]. This change:

• Prevents dpdispatcher from trying to upload non-existent common files
• Aligns VASP behavior with ABACUS, which also returns [] for similar reasons
• Maintains all existing functionality since INCAR/POTCAR files are still created per-task via make_input_file() and make_potential_files() methods
• Preserves the forward_files() method which correctly returns task-specific files

Testing

• All existing tests pass (67/67 tests in auto_test module)
• Added comprehensive test cases to verify the fix works for all property types
• Verified that forward_files() still returns correct task-specific files: ["INCAR", "POSCAR", "KPOINTS", "POTCAR"]

Fixes #1139.

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[njzjz]

pre-commit.ci autofix

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 49.84%. Comparing base (31043b0) to head (34ce655).

Additional details and impacted files

@@            Coverage Diff             @@
##            devel    #1811      +/-   ##
==========================================
+ Coverage   49.80%   49.84%   +0.03%     
==========================================
  Files          83       83              
  Lines       14904    14899       -5     
==========================================
+ Hits         7423     7426       +3     
+ Misses       7481     7473       -8     

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