Prepare azure-messaging-servicebus 7.18.0-beta.2 for release (#49596)

- Date-stamp CHANGELOG entry: (Unreleased) -> (2026-06-22)

- Update README dependency snippet to 7.18.0-beta.2

Co-authored-by: Eldert Grootenboer (from Dev Box) <egrootenboer@microsoft.com>

Author: EldertGrootenboer

sdk/servicebus/azure-messaging-servicebus/CHANGELOG.md

@@ -1,13 +1,11 @@
 # Release History
 
-## 7.18.0-beta.2 (Unreleased)
+## 7.18.0-beta.2 (2026-06-22)
 
 ### Features Added
 
 - Added `drainTimeout(Duration)` to `ServiceBusProcessorClientBuilder` and `ServiceBusSessionProcessorClientBuilder` to configure the maximum wait time for in-flight message handlers during processor shutdown. Defaults to 30 seconds.
 
-### Breaking Changes
-
 ### Bugs Fixed
 
 - Fixed `ServiceBusProcessorClient.close()` disposing the receiver before in-flight message handlers could complete settlement, causing `IllegalStateException`. The processor now drains active handlers before closing. ([#45716](https://github.com/Azure/azure-sdk-for-java/issues/45716))

sdk/servicebus/azure-messaging-servicebus/README.md

@@ -70,7 +70,7 @@ add the direct dependency to your project as follows.
 <dependency>
     <groupId>com.azure</groupId>
     <artifactId>azure-messaging-servicebus</artifactId>
-    <version>7.17.13</version>
+    <version>7.18.0-beta.2</version>
 </dependency>
 ```
 [//]: # ({x-version-update-end})