Intent of TestUpdate_ReadFileFailShouldRetry

All 2 exact tests in this concept. Every test is marked by where it enters the hierarchy.

go.temporal.io/ 2 tests
- server/ 2 tests
  - common/ 2 tests
    
    dynamicconfig/ 2 tests
    
    TestFileBasedClientSuite/ 2 tests
    
    go.temporal.io/server/common/dynamicconfig/TestFileBasedClientSuite/TestUpdate_EmitsGaugeMetricOnFailure Inherited TestUpdate_EmitsGaugeMetricOnFailure
    
    go.temporal.io/server/common/dynamicconfig/TestFileBasedClientSuite/TestUpdate_ReadFileFailShouldRetry Introduced here