Merge branch 'fix-filter-label-tooltip' into 'master'

Fix filter label tooltip HTML rendering

## What does this MR do?
Tooltips on labels used in a filter are now rendered as HTML

## Are there points in the code the reviewer needs to double check?
Shouldn't be

## Why was this MR needed?
Fix existing bug (See screenshot below for reference)

## What are the relevant issue numbers?
Closes #20592 

## Screenshots (if relevant)
Before:
![Screen_Shot_2016-08-04_at_10.27.59_AM__2_](/uploads/7ca37d4116f15a2d22ad16fbbe682f1f/Screen_Shot_2016-08-04_at_10.27.59_AM__2_.png)

After:
![Screen_Shot_2016-08-04_at_10.24.37_AM__2_](/uploads/7fce6c8a93d293767dacbcd682831f86/Screen_Shot_2016-08-04_at_10.24.37_AM__2_.png)

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- Tests
  - [x] All builds are passing
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

See merge request !5671

CHANGELOG

@@ -13,6 +13,7 @@ v 8.11.0 (unreleased)
   - Ignore URLs starting with // in Markdown links !5677 (winniehell)
   - Fix CI status icon link underline (ClemMakesApps)
   - The Repository class is now instrumented
+  - Fix filter label tooltip HTML rendering (ClemMakesApps)
   - Cache the commit author in RequestStore to avoid extra lookups in PostReceive
   - Expand commit message width in repo view (ClemMakesApps)
   - Cache highlighted diff lines for merge requests

app/assets/stylesheets/pages/labels.scss

@@ -182,6 +182,17 @@
   .btn {
     color: inherit;
   }
+
+  a.btn {
+    padding: 0;
+
+    .has-tooltip {
+      top: 0;
+      border-top-right-radius: 0;
+      border-bottom-right-radius: 0;
+      line-height: 1.1;
+    }
+  }
 }
 
 .label-options-toggle {

app/views/shared/_labels_row.html.haml

 - labels.each do |label|
   %span.label-row.btn-group{ role: "group", aria: { label: label.name }, style: "color: #{text_color_for_bg(label.color)}" }
-    = link_to label.name, label_filter_path(@project, label, type: controller.controller_name),
-      class: "btn btn-transparent has-tooltip",
-      style: "background-color: #{label.color};",
-      title: escape_once(label.description),
-      data: { container: "body" }
+    = link_to_label(label, css_class: 'btn btn-transparent')
     %button.btn.btn-transparent.label-remove.js-label-filter-remove{ type: "button", style: "background-color: #{label.color};", data: { label: label.title } }
       = icon("times")