Add a banner informing about token expiration

What does this MR do and why?

We are backporting !154944 (merged) into this stable version.

Display a banner to all users, similar to broadcast banners, for GitLab version between 16.0 and 17.0, both included. The banner informs about upcoming expiration of tokens and how to troubleshoot the expiration.

The banner is dismissable. The data is persisted in the browser cookie and expires in one year from the date it has been dismissed. Like other broadcast banners, if the user opens an incognito window the banner reappears.

Changelog: changed

MR acceptance checklist

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

• This MR is backporting a bug fix, documentation update, or spec fix, previously merged in the default branch.
• The MR that fixed the bug on the default branch has been deployed to GitLab.com (not applicable for documentation or spec changes).
• This MR has a severity label assigned (if applicable).
• Set the milestone of the merge request to match the target backport branch version.
• This MR has been approved by a maintainer (only one approval is required).
• Ensure the e2e:package-and-test-ee job has either succeeded or been approved by a Software Engineer in Test.

Note to the merge request author and maintainer

If you have questions about the patch release process, please:

• Refer to the patch release runbook for engineers and maintainers for guidance.
• Ask questions on the #releases Slack channel (internal only).

.gitlab/ci/package-and-test/main.gitlab-ci.yml

@@ -371,7 +371,11 @@ oauth:
     - .qa
     - .failure-videos
   variables:
-    QA_SCENARIO: Test::Integration::OAuth
+    QA_SCENARIO: Test::Instance::Image
+    QA_GITLAB_HOSTNAME: "gitlab"
+    QA_GITLAB_USE_TLS: "true"
+    QA_RSPEC_TAGS: --tag oauth
+    GITLAB_QA_OPTS: --omnibus-config github_oauth
   rules:
     - !reference [.rules:test:qa-default-branch, rules]
     - if: $QA_SUITES =~ /Test::Integration::OAuth/