Remove `ci_skip_require_credit_card_for_addon_ci_minutes` feature flag
What does this MR do and why?
In !77829 (merged), we waived the credit card validation requirement for namespaces with paid CI/CD minutes.
In !78591 (merged), we enabled this feature by default.
This commit drops this feature flag altogether.
Relates to #349841 (closed)
MR acceptance checklist
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I have evaluated the MR acceptance checklist for this MR.
Edited by Stan Hu