fix: align list-sessions pagination to .NET short-page termination

[EldertGrootenboer]

Summary

Aligns listSessions() / get-message-sessions pagination termination with the .NET SDK's short-page rule: enumeration stops when the broker returns a page with fewer session IDs than the requested page size (a short or empty page signals the end), instead of continuing until an explicit empty page.

This matches .NET's if (page.Count < SessionBrowsePageSize) break; and brings all five Service Bus SDKs to identical termination behavior:

SDK	Termination
.NET	page.Count < SessionBrowsePageSize
JS	nextPageLink: page.length >= top ? ... : undefined
Python	len(result) < _PAGE_SIZE
Go	len(page) < listSessionsPageSize
Java (this PR)	sessionIds.size() < pageSize

Behavior

• Full page (size == pageSize): continue to the next page.
• Short or empty page (size < pageSize): stop; the last page's IDs are still returned.
• Saves one broker round-trip in the common partial-last-page case. An exact-multiple-of-page-size result set still fetches a final empty page (unavoidable).

Changes

• ServiceBusSessionReceiverAsyncClient.fetchSessionPage terminates on a short page.
• Public javadoc on both listSessions() overloads and the ServiceBusManagementNode.getMessageSessions contract updated to describe short-page termination.
• ServiceBusSessionReceiverAsyncClientTest rewritten so each pagination test drives a full first page (exercising the cursor / server-skip logic under short-page termination).

Testing

• 12/12 ServiceBusSessionReceiverAsyncClientTest tests pass; spotless:check and checkstyle:check clean.

Refinement to the unreleased 7.18.0-beta.3 feature; no new changelog entry.

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[Copilot]

Pull request overview

This PR updates Service Bus session ID pagination termination in the Java SDK to match the “short page ends enumeration” behavior used by the other Service Bus SDKs (notably .NET): paging stops when the service returns fewer session IDs than the requested page size, rather than requiring an explicitly empty page.

Changes:

• Updated ServiceBusSessionReceiverAsyncClient.fetchSessionPage to terminate pagination when sessionIds.size() < pageSize.
• Updated public JavaDoc for listSessions() overloads and the ServiceBusManagementNode.getMessageSessions contract to document short-page termination semantics.
• Reworked pagination tests to ensure the first page is a full page (so the continuation-token/cursor path is exercised under the new termination rule).

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
sdk/servicebus/azure-messaging-servicebus/src/main/java/com/azure/messaging/servicebus/ServiceBusSessionReceiverAsyncClient.java	Changes paging termination from “empty page” to “short page” and updates method JavaDoc accordingly.
sdk/servicebus/azure-messaging-servicebus/src/main/java/com/azure/messaging/servicebus/implementation/ServiceBusManagementNode.java	Updates the management-node contract documentation to describe short-page termination.
sdk/servicebus/azure-messaging-servicebus/src/test/java/com/azure/messaging/servicebus/ServiceBusSessionReceiverAsyncClientTest.java	Updates tests to validate the new termination behavior while still exercising cursor/skip handling.

[EldertGrootenboer]

/azp run java - pullrequest

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[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated no new comments.

[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated no new comments.

[azure-pipelines]

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