Rename variable-models to_runner_variable to to_hash_variable
What does this MR do and why?
The to_runner_variable methods in the variable-models are confusing
because the returned objects are not directly used for sending to
Runner.
The to_runner_variable naming should only be used
via to_runner_variables and that should only be called when returning
a value to Runner.
- Related to Memory optimization for Ci::Variables::Collection* (#499707 - closed)
- Full picture POC: Optimize memory usage of CI variables coll... (!171387 - closed)
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