Remove non-responsive text alignment classes

These can be replaced by their `.text-xs-*` parallels.
This also avoids any complications from interactions between the responsive and non-responsive classes.
(e.g. `<div class="text-left text-md-right">`)

Refs #18300
[skip sauce]

scss/_utilities.scss

@@ -46,9 +46,6 @@
 
 // Alignment
 
-.text-left           { text-align: left !important; }
-.text-right          { text-align: right !important; }
-.text-center         { text-align: center !important; }
 .text-justify        { text-align: justify !important; }
 .text-nowrap         { white-space: nowrap !important; }
 .text-truncate       { @include text-truncate; }