Intent of WithoutSetTrailer, AddsMetadataContext

All 3 exact tests in this concept. Every test is marked by where it enters the hierarchy.

go.temporal.io/ 3 tests
- server/ 3 tests
  - common/ 3 tests
    
    rpc/ 3 tests
    
    interceptor/ 3 tests
    
    TestContextMetadataInterceptor_Intercept/ 3 tests
    
    go.temporal.io/server/common/rpc/interceptor/TestContextMetadataInterceptor_Intercept/AddsMetadataContext Introduced here
    
    go.temporal.io/server/common/rpc/interceptor/TestContextMetadataInterceptor_Intercept/WithSetTrailer_WithMetadata Inherited WithSetTrailer_WithMetadata
    
    go.temporal.io/server/common/rpc/interceptor/TestContextMetadataInterceptor_Intercept/WithoutSetTrailer Introduced here