Change Prometheus proxy API to accept variables parameter as Hash only
What does this MR do?
Our Prometheus proxy GET API currently accepts the variables query parameter as an array. Unfortunately, we have observed that the order of elements in the array can be changed by components between the frontend and backend.
In the backend, an array like ['variable1', 'value1', 'variable2', 'value2'] is transformed into a Hash {'variable1' => 'value1', 'variable2' => 'value2'}.
To avoid the problems caused by inconsistent ordering of elements, we are now changing the format of the variables query parameter to a Hash.
This MR changes the API to accept only a Hash. The frontend has been changed to send a Hash in !33062 (merged).
Issue: #219179 (closed)
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Does this MR meet the acceptance criteria?
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