ref(less): Remove unused sentry-grid.less (#30716)

static/app/components/versionHoverCard.tsx

@@ -112,7 +112,7 @@ class VersionHoverCard extends React.Component<Props, State> {
       ),
       body: (
         <div>
-          <div className="row row-flex">
+          <div className="row">
             <div className="col-xs-4">
               <h6>{t('New Issues')}</h6>
               <div className="count-since">{release.newGroups}</div>

static/less/sentry-grid.less

@@ -1,22 +0,0 @@
-//
-// Sentry Grid
-// Extends Bootstrap 3's grids to allow for:
-// - Flexbox-based layouts
-// - Center columns vertically
-
-.row {
-  &.row-flex {
-    display: flex;
-    flex-wrap: wrap;
-
-    &:before,
-    &:after {
-      display: initial;
-    }
-  }
-
-  &.row-center-vertically {
-    display: flex;
-    align-items: center;
-  }
-}

static/less/sentry.less

@@ -17,7 +17,6 @@
 
 // App components
 @import url('./shared-components.less');
-@import url('./sentry-grid.less');
 @import url('./sentry-hovercard.less');
 @import url('./layout.less');
 @import url('./fonts.less');