Add Verify stage contributions guidelines to development docs
What does this MR do and why?
This merge request adds a basic development contributions guidelines for Verify stage, to highlight the importance of reliability and security. See #341946 (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 Grzegorz Bizon