Update codeowners for older Event Hubs and Service Bus packages (Azure#23824)

Adding 
- @shankarsama and @yvgopal as code owners for the package under the folder microsoft-azure-servicebus
- @sjkwak and @JamesBirdsall as code owners for the packages under the folders microsoft-azure-eventhubs*

This will result in 2 things
- All PRs to these package will add the above mentioned owners as code reviewers automatically
- Test failure notifications for these packages will go to the emails of the above mentioned owners

Author: ramya-rao-a

.github/CODEOWNERS

@@ -67,6 +67,15 @@
 # PRLabel: %Event Hubs
 /sdk/eventhubs/                                     @conniey @anuchandy @ki1729 @srnagar
 
+# PRLabel: %Event Hubs
+/sdk/eventhubs/microsoft-azure-eventhubs-eph/       @JamesBirdsall @sjkwak
+
+# PRLabel: %Event Hubs
+/sdk/eventhubs/microsoft-azure-eventhubs-extensions/  @JamesBirdsall @sjkwak
+
+# PRLabel: %Event Hubs
+/sdk/eventhubs/microsoft-azure-eventhubs/           @JamesBirdsall @sjkwak
+
 # PRLabel: %Cognitive - Form Recognizer
 /sdk/formrecognizer/                                @samvaity @mssfang
 
@@ -102,7 +111,10 @@
 /sdk/search/                                        @alzimmermsft @pallavit @mssfang @samvaity
 
 # PRLabel: %Service Bus
-/sdk/servicebus/                                    @yvgopal @nemakam @anuchandy @ki1729 @conniey
+/sdk/servicebus/                                    @anuchandy @ki1729 @conniey
+
+# PRLabel: %Service Bus
+/sdk/servicebus/microsoft-azure-servicebus/         @shankarsama @yvgopal
 
 # PRLabel: %Storage
 /sdk/storage/                                       @amishra-dev @rickle-msft @jaschrep-msft @alzimmermsft @kasobol-msft