Remove startup CSS CI tasks
What does this MR do and why?
Remove startup_css CI jobs. Feature flag has been enabled on Gitlab for 2 months, and usages were removed in !124406 (merged), so we no longer need to update the files.
The generated CSS files are being removed in !124404 (merged)
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.
Edited by Simon Knox