Merge branch '18521-tanuki-logo' into 'master'

Lighten each logo path color instead of white

## What does this MR do?
Changes highlight/loading colors of tanuki from white to a lighter version of each path color

## Why was this MR needed?
Since the logo is no longer on the dark sidebar, the highlight color was getting lost against the light gray background

## What are the relevant issue numbers?
Closes #18521 

## Screenshots (if relevant)
![logo](/uploads/3743925862fa8e17d2fec426f7e4c853/logo.gif)

cc @jschatz1 @lbennett @dzaporozhets 

See merge request !4690

CHANGELOG

@@ -108,6 +108,7 @@ v 8.9.0 (unreleased)
   - Include user relationships when retrieving award_emoji
   - Various associations are now eager loaded when parsing issue references to reduce the number of queries executed
   - Set inverse_of for Project/Service association to reduce the number of queries
+  - Update tanuki logo highlight/loading colors
 
 v 8.8.5
   - Import GitHub repositories respecting the API rate limit !4166

app/assets/stylesheets/framework/header.scss

@@ -2,6 +2,17 @@
  *  Application Header
  *
  */
+@mixin tanuki-logo-colors($path-color) {
+  fill: $path-color;
+  transition: all 0.8s;
+
+  &:hover,
+  &.highlight {
+    fill: lighten($path-color, 25%);
+    transition: all 0.1s;
+  }
+}
+
 header {
   transition: padding $sidebar-transition-duration;
 
@@ -191,13 +202,24 @@ header {
   }
 }
 
-.tanuki-shape {
-  transition: all 0.8s;
+#tanuki-logo {
 
-  &:hover, &.highlight {
-    fill: rgb(255, 255, 255);
-    transition: all 0.1s;
+  #tanuki-left-ear,
+  #tanuki-right-ear,
+  #tanuki-nose {
+    @include tanuki-logo-colors($tanuki-red);
+  }
+
+  #tanuki-left-eye,
+  #tanuki-right-eye {
+    @include tanuki-logo-colors($tanuki-orange);
   }
+
+  #tanuki-left-cheek,
+  #tanuki-right-cheek {
+    @include tanuki-logo-colors($tanuki-yellow);
+  }
+
 }
 
 @media (max-width: $screen-xs-max) {

app/assets/stylesheets/framework/sidebar.scss

@@ -55,17 +55,6 @@
   }
 }
 
-
-.tanuki-shape {
-  transition: all 0.8s;
-
-  &:hover, &.highlight {
-    fill: rgb(255, 255, 255);
-    transition: all 0.1s;
-  }
-}
-
-
 .nav-sidebar {
   position: absolute;
   top: 50px;

app/assets/stylesheets/framework/variables.scss

@@ -156,6 +156,11 @@ $warning-message-border: #f0e2bb;
 /* header */
 $light-grey-header: #faf9f9;
 
+/* tanuki logo colors */
+$tanuki-red: #e24329;
+$tanuki-orange: #fc6d26;
+$tanuki-yellow: #fca326;
+
 /*
  * State colors:
  */