Update the runner page alerts

- replace alerts with shared alert
- remove unused instance alert

Changelog: changed

app/views/shared/runners/_runner_type_alert.html.haml

-.gl-alert.gl-alert-info.gl-my-5
-  = sprite_icon('information-o', css_class: 'gl-alert-icon')
-  - if runner.instance_type?
-    %h4.gl-alert-title
-      = s_('Runners|This runner is available to all groups and projects in your GitLab instance.')
-    .gl-alert-body
-      = s_('Runners|Shared runners are available to every project in a GitLab instance. If you want a runner to build only specific projects, restrict the project in the table below. After you restrict a runner to a project, you cannot change it back to a shared runner.')
-      = link_to _('Learn more.'), help_page_path('ci/runners/runners_scope', anchor: 'shared-runners'), target: '_blank', rel: 'noopener noreferrer'
-  - elsif runner.group_type?
-    %h4.gl-alert-title
-      = s_('Runners|This runner is available to all projects and subgroups in a group.')
+- alert_class = 'gl-mb-5'
+
+- if runner.group_type?
+  = render 'shared/global_alert',
+    alert_class: alert_class,
+    title: s_('Runners|This runner is available to all projects and subgroups in a group.') do
     .gl-alert-body
       = s_('Runners|Use Group runners when you want all projects in a group to have access to a set of runners.')
       = link_to _('Learn more.'), help_page_path('ci/runners/runners_scope', anchor: 'group-runners'), target: '_blank', rel: 'noopener noreferrer'
-  - else
-    %h4.gl-alert-title
-      = s_('Runners|This runner is associated with specific projects.')
+- else
+  = render 'shared/global_alert',
+    alert_class: alert_class,
+    title: s_('Runners|This runner is associated with specific projects.') do
     .gl-alert-body
       = s_('Runners|You can set up a specific runner to be used by multiple projects but you cannot make this a shared runner.')
       = link_to _('Learn more.'), help_page_path('ci/runners/runners_scope', anchor: 'specific-runners'), target: '_blank', rel: 'noopener noreferrer'

locale/gitlab.pot

@@ -32183,9 +32183,6 @@ msgstr ""
 msgid "Runners|Select your preferred option here. In the next step, you can choose the capacity for your runner in the AWS CloudFormation console."
 msgstr ""
-msgid "Runners|Shared runners are available to every project in a GitLab instance. If you want a runner to build only specific projects, restrict the project in the table below. After you restrict a runner to a project, you cannot change it back to a shared runner."
-msgstr ""
-
 msgid "Runners|Show runner installation and registration instructions"
 msgstr ""
@@ -32228,9 +32225,6 @@ msgstr ""
 msgid "Runners|This runner is associated with specific projects."
 msgstr ""
-msgid "Runners|This runner is available to all groups and projects in your GitLab instance."
-msgstr ""
-
 msgid "Runners|This runner is available to all projects and subgroups in a group."
 msgstr ""