Show warning banner to administrators about upcoming deprecation/removal of support of the Operating System version

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Overview

When the Operating System version that GitLab (using Linux packages) is running on gets near its End-of-Life (EOL) period, display a warning banner to GitLab administrators. This provides proactive notification to system administrators about upcoming OS deprecation and removal of support, complementing existing messaging mechanisms.

Background

With the merge of omnibus-gitlab!8694 (merged), the necessary OS support information will be available to the GitLab Rails project. This data will be provided in a file named supported_os_data.yml located at the Rails root directory.

Definition of Done

• Detect running OS. We already have ohai in the bundle, which can do this.
• Fetch EOL information from supported_os_data.yml file.
• If EOL is more than 6 months away, show no banner in admin page.
• If EOL is 6 months away, show an orange banner that is dismissable indicating that the OS will be EOL soon, and users should migrate to a newer version to continue receiving GitLab packages.
• If EOL is 3 months away, show a red banner that is dismissable indicating that the OS will be EOL soon, and users should migrate to a newer version to continue receiving GitLab packages.
• If EOL is 1 month away, make the banner non-dismissable.