Fix Announce Regression

[vazois]

Fix regression for cluster announce endpoint when using IPEndPoint.Any

[Copilot]

Pull Request Overview

This PR fixes a regression for the cluster announce endpoint when using IPEndPoint.Any by refining the endpoint resolution logic and adding a dedicated test.

• Adds a new test (ClusterAnyIPAnnounce) that exercises the announce behavior using IPAddress.Any.
• Updates the endpoint creation in StoreWrapper to use localEndPoint.Port for both IPv4 and IPv6 resolution.

Reviewed Changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
test/Garnet.test.cluster/ClusterConfigTests.cs	New test added to validate announce endpoint behavior using IPAddress.Any.
libs/server/StoreWrapper.cs	Modified endpoint construction to use localEndPoint.Port, fixing the regression bug.

Files not reviewed (1)

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Comments suppressed due to low confidence (3)

test/Garnet.test.cluster/ClusterConfigTests.cs:141

• [nitpick] Consider renaming the test method to 'ClusterAnyIPAnnounceTest' for consistency with the naming conventions observed in the test suite.

public void ClusterAnyIPAnnounce()

libs/server/StoreWrapper.cs:297

• [nitpick] Add an inline comment to clarify why 'localEndPoint.Port' is used instead of 'endPoint.Port', as this change may be non-obvious to future readers.

return new IPEndPoint(endPoint.Address, localEndPoint.Port);

libs/server/StoreWrapper.cs:306

• [nitpick] Similarly, add a comment explaining the rationale for using 'localEndPoint.Port' in the IPv6 resolution block to improve code clarity.

return new IPEndPoint(endPoint.Address, localEndPoint.Port);