Update API Security templates for 15.0
What does this MR do and why?
Promote the "latest" (unstable) templates and specs to current (stable), and update to version 2.
Related to #359040 (closed)
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 David Nelson