ci: pyvista/setup-headless-display started failing

[RobPasMue]

Windows self-hosted runners experiencing issues with shell: bash commands. This will define the environment variable PYVISTA_OFF_SCREEN on behalf of the action, and we will skip the failing part as well.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 91.83%. Comparing base (4d0a554) to head (df81068). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1447 +/- ## ======================================= Coverage 91.83% 91.83% ======================================= Files 86 86 Lines 6880 6880 ======================================= Hits 6318 6318 Misses 562 562 ```

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