[release/9.4] Ensure all YARP env vars are strings #10435
                
     Merged
            
            
          
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Backport of #10434 to release/9.4
/cc @eerhardt
Customer Impact
When someone uses YARP and an Azure resource in the same app, it fails to run or publish.
Testing
Added a new test to ensure all env vars are strings.
Risk
Minimal - only affects YARP, which is new, in preview, and is isolated from everything else.
Regression?
No