Improve the code readability of health info method

[jokoyoski]

In the refactored code:

The calculation of the total variable has been moved within the if condition to eliminate the need for a separate variable declaration.
Instead of comparing total with 0 in the if statement, we directly compare successes + failures with 0.
The calculation of failureRate has been separated into its own variable for clarity.
The result is returned as a HealthInfo object, with the successes + failures value and the failureRate value passed as arguments.
These changes improve readability and maintain the original functionality of the code.

[jokoyoski]

@dotnet-policy-service agree

…

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[martincostello]

Thanks for your suggestion, but I don't agree that this improves the readability in this case.

In the worst case this performs the same addition three times now (which is why total was used to store the computation) so degrades performance, and also changes the indenting to not match the existing level of indentation used in the code style.

[martintmk]

@jokoyoski

Thanks for your contribution, although this change might not be merged, you can check #1290 which proposes similar cleanup in the Polly codebase.