Remove the manual renewal banner
What does this MR do and why?
Part of https://gitlab.com/gitlab-org/gitlab/-/issues/364651+
The manual renewal banner (introduced in https://gitlab.com/gitlab-org/gitlab/-/issues/346259) is no longer needed as it will be replaced by a new banner reminding instance admins to submit their seat utilization data via email if they have an Offline Cloud License (see https://gitlab.com/gitlab-org/gitlab/-/issues/353804).
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.