Fix test assertions for enhanced move operation error messages

[Copilot]

• Update test_move_file_slash_src to match new error message format
• Update test_move_file_slash_dest to match new error message format
• Update test_move_nonexistent_src to match new error message format
• Update test_move_from_subdir_abspaths to match new error message format
• Update test_move_from_subdir_as_dot to match new error message format
• Verify Python syntax of modified files
• Fix line length linting errors (E501)
• Commit and push changes
• Wait for CI tests to pass

---

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.11%. Comparing base (c89f6af) to head (750ddfa).
⚠️ Report is 26 commits behind head on enh-lad-errors-paths.

Additional details and impacted files

@@                    Coverage Diff                    @@
##           enh-lad-errors-paths    #1802       +/-   ##
=========================================================
+ Coverage                 50.45%   75.11%   +24.66%     
=========================================================
  Files                        84       84               
  Lines                     11922    11925        +3     
=========================================================
+ Hits                       6015     8958     +2943     
+ Misses                     5907     2967     -2940     

Flag	Coverage Δ
unittests	75.11% <100.00%> (+24.66%)	⬆️

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

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[CodyCBakerPhD]

@copilot Please fix the linting errors: https://github.com/dandi/dandi-cli/actions/runs/22012555381/job/63608992590?pr=1802#step:6:19

[Copilot]

@copilot Please fix the linting errors: https://github.com/dandi/dandi-cli/actions/runs/22012555381/job/63608992590?pr=1802#step:6:19

Fixed the linting errors. The issue was three lines exceeding the 100-character limit (lines 378, 410, and 436). Refactored by extracting the conditional expressions into variables (asset_type and path_type) and breaking long strings across multiple lines. Changes committed in 750ddfa.