Updating go.mod rule to take into account some of the exceptions (#25590)

Updating go.mod rule to take into account some of the exceptions, in our tree.

Author: richardpark-msft

.github/instructions/go-mod-standards.instructions.md

@@ -2,7 +2,24 @@
 applyTo: '**/go.mod'
 ---
 
-- go.mod should only have direct reference to modules within the azure-sdk-for-go (ie: github.com/Azure/azure-sdk-for-go/sdk/<modules>), standard library modules or modules that begin with `golang.org/x/`
-- go.mod can have indirect dependencies to 3rd party modules, with the exception of:
+go.mod should only have direct reference to:
+- modules within the azure-sdk-for-go (ie: github.com/Azure/azure-sdk-for-go/sdk/<modules>)
+- Go standard library modules or modules that begin with `golang.org/x/`
+- 3rd party modules, but within this list:
   - github.com/stretchr/testify
-  
+  - github.com/joho/godotenv
+  - go.opentelemetry.io/otel/*
+  - github.com/golang/mock
+
+azidentity can directly reference additional 3rd party modules:
+- github.com/AzureAD/microsoft-authentication-extensions-for-go/*
+- github.com/golang-jwt/jwt/v5
+- github.com/google/uuid # this is only used by a test
+
+azservicebus and azeventhubs can directly reference additional 3rd party modules:
+- github.com/coder/websocket
+- github.com/Azure/go-amqp
+
+azopenai can directly reference additional 3rd party modules:
+- github.com/openai/openai-go/v3
+