Remove unused desktop-first responsive CSS utils
What does this MR do?
This removes unused desktop-first responsive utils. We have confirmed that those aren't used using SourceGraph, verification URLs are provided below. In each case, we do exact matches of the utils and we also try to find interpolated usages. Remaining desktop-first utils are still being used and will need to be migrated to mobile-first approaches, which will be done in a follow-up.
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gl-sm-pb-[0-5]: https://sourcegraph.com/search?q=context:global+%28%5C%7D%7Cgl-sm%29-pb-%5B0-5%5D+repo:%5Egitlab%5C.com/gitlab-org/%5B%5E/%5D%2B%24&patternType=regexp -
gl-sm-pl-[1-4]: https://sourcegraph.com/search?q=context:global+%28%5C%7D%7Cgl-sm%29-pl-%5B1-4%5D+repo:%5Egitlab%5C.com/gitlab-org/%5B%5E/%5D%2B%24&patternType=regexp -
gl-sm-pr-[014]: https://sourcegraph.com/search?q=context:global+%28%5C%7D%7Cgl-sm%29-pr-%5B014%5D+repo:%5Egitlab%5C.com/gitlab-org/%5B%5E/%5D%2B%24&patternType=regexp -
gl-xs-display-flex: https://sourcegraph.com/search?q=context:global+%28%5C%7D%7Cgl-xs%29-display-flex+repo:%5Egitlab%5C.com/gitlab-org/%5B%5E/%5D%2B%24&patternType=regexp -
gl-xs-display-inline-flex: https://sourcegraph.com/search?q=context:global+%28%5C%7D%7Cgl-xs%29-display-inline-flex+repo:%5Egitlab%5C.com/gitlab-org/%5B%5E/%5D%2B%24&patternType=regexp -
gl-xs-display-block: https://sourcegraph.com/search?q=context:global+%28%5C%7D%7Cgl-xs%29-display-block+repo:%5Egitlab%5C.com/gitlab-org/%5B%5E/%5D%2B%24&patternType=regexp -
gl-xs-display-inline: https://sourcegraph.com/search?q=context:global+%28%5C%7D%7Cgl-xs%29-display-inline+repo:%5Egitlab%5C.com/gitlab-org/%5B%5E/%5D%2B%24&patternType=regexp -
gl-xs-display-inline-block: https://sourcegraph.com/search?q=context:global+%28%5C%7D%7Cgl-xs%29-display-inline-block+repo:%5Egitlab%5C.com/gitlab-org/%5B%5E/%5D%2B%24&patternType=regexp -
gl-xs-align-items-baseline: https://sourcegraph.com/search?q=context:global+%28%5C%7D%7Cgl-xs%29-align-items-baseline+repo:%5Egitlab%5C.com/gitlab-org/%5B%5E/%5D%2B%24&patternType=regexp