fix(testing): drop stale plugin checks, count failed validations

validate_hyprland_plugins and validate_hyprpm_hook checked for the hyprland-plugins-setup script and the hyprpm pacman hook, both removed in 225cc76 (Hyprland 0.54 brings the layouts into core). I deleted the two functions and their calls in validate_window_manager.

I also disabled errexit in run-test.sh from the validation phase onward, so one failed check is counted in VALIDATION_FAILED instead of aborting the run before the report or VM cleanup. About 16 validations across the file do a bare `return 1` after `validation_fail`; any of them firing under the previous behavior would have killed the harness mid-run.

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