Remove unused methods from helpers
What does this MR do and why?
Contributes to #420057
Problem
We have unused methods defined in helpers. They have no value to us.
Solution
Remove unused methods definitions and related tests.
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.