Intent of valid_input

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
  - chasm/ 2 tests
    
    TestNexusEndpointProcessor_ProcessInput/ 1 test
    
    go.temporal.io/server/chasm/TestNexusEndpointProcessor_ProcessInput/valid_request Inherited valid_request
    
    TestNexusServiceProcessor_ProcessInput/ 1 test
    
    go.temporal.io/server/chasm/TestNexusServiceProcessor_ProcessInput/valid_input Introduced here