Issue #3087006 by longwave, lauriii, alexpott: Drop .stylelintignore in 10.x

core/.stylelintignore

-themes/claro/**/*.css
-!themes/claro/**/*.pcss.css
-themes/olivero/**/*.css
-!themes/olivero/**/*.pcss.css
-misc/dialog/off-canvas/css/**/*.css
-!misc/dialog/off-canvas/css/**/*.pcss.css
-modules/layout_builder/css/**/*.css
-!modules/layout_builder/css/**/*.pcss.css
-modules/workspaces/css/**/*.css
-!modules/workspaces/css/**/*.pcss.css
-themes/stable9/css/core/dialog/off-canvas.reset.css
-themes/stable9/css/core/dialog/off-canvas.base.css