Minor changes for onboarding popovers

- Increase button size
- Change class names
- Utilize cssClasses of popover components
- Fix  action popover specs

ee/app/assets/javascripts/onboarding/onboarding_helper/components/action_popover.vue

@@ -60,8 +60,8 @@ export default {
     boundary="viewport"
     :placement="placement"
     :show="showPopover"
-    :css-classes="['blue', 'onboarding-action-popover-container']"
+    :css-classes="['blue', 'onboarding-popover']"
   >
-    <div class="onboarding-popover" v-html="content"></div>
+    <div v-html="content"></div>
   </gl-popover>
 </template>

ee/app/assets/javascripts/onboarding/onboarding_helper/components/help_content_popover.vue

@@ -48,15 +48,16 @@ export default {
     :placement="placement"
     :show="show"
     :disabled="disabled"
+    :css-classes="['onboarding-popover']"
   >
-    <div class="onboarding-popover">
+    <div>
       <p v-html="helpContent.text"></p>
       <template v-if="helpContent.buttons">
         <gl-button
           v-for="(button, index) in helpContent.buttons"
           :key="index"
           :class="button.btnClass"
-          class="btn btn-xs mr-2"
+          class="btn btn-sm mr-2"
           :disabled="button.disabled"
           @click="callButtonAction(button)"
         >

ee/spec/javascripts/onboarding/onboarding_helper/components/action_popover_spec.js

@@ -80,7 +80,7 @@ describe('User onboarding action popover', () => {
 
   describe('template', () => {
     it('shows the content passed in as prop', () => {
-      expect(wrapper.find('.onboarding-popover').text()).toEqual(content);
+      expect(wrapper.text()).toEqual(content);
     });
   });
 });