Move Slack upgrade alert to top of page

Justin Ho Tuan Duongrequested to merge
384878-move-alert-box-that-recommendations-upgrading-gitlab-for-slack-app-to-be-above-trigger into master

What does this MR do and why?

To make it easier for users to see.

This change is behind the feature flag integration_slack_app_notifications.

Screenshots or screen recordings

Before After
GitLab_for_Slack_app_before GitLab_for_Slack_app_after

How to set up and validate locally

Follow the steps here: !102249 (merged)

Then go to Project > Integrations > GitLab for Slack app. For example, http://127.0.0.1:3000/gitlab-org/gitlab-test/-/settings/integrations/gitlab_slack_application/edit.

MR acceptance checklist

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

Related to #384878 (closed)

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