[Compiler] Adjust parameters to reduce run-time when race detector is enabled

[turbolent]

Work towards #3742

Description

TestRecursiveFib takes longer than the default timeout of 10min when the race detector is enabled, which is the case on CI. I don't know/understand why.

Testing a smaller is sufficient and brings down the run-time to a reasonable sub-second amount.

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[github-actions]

Cadence Benchstat comparison

This branch with compared with the base branch onflow:feature/compiler commit c942246
The command for i in {1..N}; do go test ./... -run=XXX -bench=. -benchmem -shuffle=on; done was used.
Bench tests were run a total of 7 times on each branch.

Collapsed results for better readability

[SupunS]

Thanks for fixing this! A larger value for n must have gotten committed accidentally; I remember the value was 7 or something (similar to the imperative fib). I think the recursive fib time increases exponentially somewhere after n=35. Maybe that's why it takes a longer time in CI.