[IMPROVE] Unused styles (#17554)

.postcssrc

.storybook/mocks/decorators.js

app/apps/client/admin/appManage.html

app/autotranslate/client/views/autoTranslateFlexTab.html

app/chatpal-search/client/template/admin.html

app/integrations/client/views/integrationsIncoming.html

app/integrations/client/views/integrationsOutgoing.html

...ntegrations/client/views/integrationsOutgoingHistory.html

...t/views/app/integrations/livechatIntegrationFacebook.html

app/livechat/client/views/app/livechatAgents.html

app/livechat/client/views/app/livechatManagers.html

app/livechat/client/views/app/livechatQueue.html

app/livechat/client/views/app/tabbar/visitorInfo.html

app/models/server/models/Settings.js

app/oauth2-server-config/client/admin/views/oauthApp.html

app/oauth2-server-config/client/oauth/oauth2-client.html

app/otr/client/rocketchat.otr.room.js

app/otr/client/stylesheets/otr.css

app/otr/client/views/otrFlexTab.html

app/theme/client/imports/general/base.css