Migrate wiki/issue rebalancing alert to Pajamas ViewComponent

What does this MR do and why?

Related to Migrate to Pajamas::AlertComponent ViewComponen... (#325384 - closed)

Screenshots or screen recordings

Before	After

Snapshot before

<div class="gl-alert gl-alert-info">
  <svg class="s16 gl-icon gl-alert-icon gl-alert-icon-no-title" data-testid="information-o-icon"><use href="/assets/icons-f305926186cfc3bb530f27269d545937c385578ba62adb0088d74f0d2d02cb56.svg#information-o"></use></svg>
  <button aria-label="Dismiss" class="js-close gl-alert-dismiss" type="button">
    <svg class="s16 gl-icon" data-testid="close-icon"><use href="/assets/icons-f305926186cfc3bb530f27269d545937c385578ba62adb0088d74f0d2d02cb56.svg#close"></use></svg>
  </button>
  <div class="gl-alert-body">
    The sidebar failed to load. You can reload the page to try again.
  </div>
</div>

Snapshot after

<div class="gl-alert gl-alert-info" role="alert">
  <svg class="s16 gl-alert-icon gl-alert-icon-no-title" data-testid="information-o-icon"><use href="/assets/icons-f305926186cfc3bb530f27269d545937c385578ba62adb0088d74f0d2d02cb56.svg#information-o"></use></svg>
  <button aria-label="Dismiss" class="btn gl-dismiss-btn btn-default btn-sm gl-button btn-default-tertiary btn-icon js-close" type="button">
    <svg class="s16" data-testid="close-icon"><use href="/assets/icons-f305926186cfc3bb530f27269d545937c385578ba62adb0088d74f0d2d02cb56.svg#close"></use></svg>
  </button>
  <div class="gl-alert-content" role="alert">
    <div class="gl-alert-body">
      The sidebar failed to load. You can reload the page to try again.

    </div>
  </div>
</div>

How to set up and validate locally

To make this work without extensive setup

1. On any project, go to Wiki
2. Create a wiki Page homeaaaaa
3. Go to http://gdk.test:3000/testg/testp/-/wikis/homeaaaaa
4. Use the following to show the alert

diff --git a/app/views/shared/wikis/_sidebar.html.haml b/app/views/shared/wikis/_sidebar.html.haml
index 5f181371663..81a5ac5749d 100644
--- a/app/views/shared/wikis/_sidebar.html.haml
+++ b/app/views/shared/wikis/_sidebar.html.haml
@@ -19,7 +19,7 @@
             = sprite_icon('pencil-square', css_class: 'gl-mr-2')
             %span= _("Edit sidebar")
 
-    - if @sidebar_error.present?
+    - if true #@sidebar_error.present?
       = render 'shared/alert_info', body: s_('Wiki|The sidebar failed to load. You can reload the page to try again.')
 
     .blocks-container

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.