Chore: use parametric variability in claim_staking_rewards benchmark, see if extrinsic can be optimized.

[shannonwells]

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claim_staking_reward worst case is 95_000_000. Let's see if it can be improved at all.

Secondly the current benchmark measures worst case only. It needs to use a range of staking parameters so the weight isn't constantly overestimated.

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