Cleanup utility classes

Removed unncessary font weight utilities (table headers have bold font
out of the box). Replaced Boostrap util with GL one.

ee/app/assets/javascripts/threat_monitoring/components/network_policy_list.vue

@@ -100,23 +100,20 @@ export default {
       const namespace = {
         key: 'namespace',
         label: s__('NetworkPolicies|Namespace'),
-        thClass: 'font-weight-bold',
       };
       const fields = [
         {
           key: 'name',
           label: s__('NetworkPolicies|Name'),
-          thClass: 'w-50 font-weight-bold',
+          thClass: 'gl-w-half',
         },
         {
           key: 'status',
           label: s__('NetworkPolicies|Status'),
-          thClass: 'font-weight-bold',
         },
         {
           key: 'updatedAt',
           label: s__('NetworkPolicies|Last modified'),
-          thClass: 'font-weight-bold',
         },
       ];
       // Adds column 'namespace' only while 'all environments' option is selected

ee/spec/frontend/threat_monitoring/components/__snapshots__/network_policy_list_spec.js.snap

@@ -25,7 +25,7 @@ exports[`NetworkPolicyList component renders policies table 1`] = `
     >
       <th
         aria-colindex="1"
-        class="w-50 font-weight-bold"
+        class="gl-w-half"
         role="columnheader"
         scope="col"
       >
@@ -35,7 +35,7 @@ exports[`NetworkPolicyList component renders policies table 1`] = `
       </th>
       <th
         aria-colindex="2"
-        class="font-weight-bold"
+        class=""
         role="columnheader"
         scope="col"
       >
@@ -45,7 +45,7 @@ exports[`NetworkPolicyList component renders policies table 1`] = `
       </th>
       <th
         aria-colindex="3"
-        class="font-weight-bold"
+        class=""
         role="columnheader"
         scope="col"
       >