MM-53814 - Updating contrast for accessibility (#24381)

* Updating contrast for accessiblity

* Updating accessbility

* Updating accessiblity for icons

* Updating header icons

* Updating text opacity

* Updating icons and text

* Updating sidebar left

* Upadating icon in system console

* Updating global header

* Updating channel list

* Updating tests and fixing conflicts

* Updating filter css

* Updating css

* Updating epehemeral message contrast

* Updating icon with 64 opacity

* Updating test

* Updating confirm license removal csss

* Updating unintended files

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Co-authored-by: Mattermost Build <build@mattermost.com>

webapp/platform/components/src/footer_pagination/footer_pagination.scss

@@ -14,7 +14,7 @@
         flex: 1;
         align-items: center;
         justify-content: flex-start;
-        color: rgba(var(--center-channel-color-rgb), 0.64);
+        color: rgba(var(--center-channel-color-rgb), 0.75);
         font-size: 12px;
         font-weight: 600;
         line-height: 16px;

webapp/platform/components/src/tour_tip/tour_tip.scss

@@ -167,11 +167,12 @@
             margin-left: 1.2rem;
             background: transparent;
             border-radius: 4px;
-            color: rgba(var(--center-channel-color-rgb), 0.56);
+            color: rgba(var(--center-channel-color-rgb), 0.64);
             font-weight: 600;
 
             &:hover {
                 background: rgba(var(--center-channel-color-rgb), 0.08);
+                color: rgba(var(--center-channel-color-rgb), 0.8);
             }
 
             &.active {