Removing Warnings SA1108 and SA1118 from NoWarn list

[henriqueholtz]

The issue or feature being addressed
Contributes to #1290

Details on the issue fix or feature implementation
Got rid of SA1108;SA1118 warnings in the Polly project

Confirm the following

• I started this PR by branching from the head of the default branch
• I have targeted the PR to merge into the default branch
• I have successfully run a local build

[henriqueholtz]

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[martincostello]

Thanks!