test(events): add synctest to subscriber tests

[akrem-chabchoub]

Checklist

• I have read the coding guide.
• My change requires a documentation update, and I have done it.
• I have added tests to cover my changes.
• I have filled out the description and linked the related issues.

Description

Add synctest in subscriber test.

Open API Spec Version Changes (if applicable)

Motivation and Context (Optional)

Related Issue (Optional)

#5232

Screenshots (if appropriate):

[Copilot]

Pull Request Overview

This PR adds testing/synctest support to the event subscriber test to better handle concurrent test scenarios. The main changes focus on wrapping the test logic with synctest.Test() and temporarily narrowing the CI test scope to a specific package.

• Wrapped the concurrent test logic in synctest.Test() to improve deterministic testing of goroutines and channels
• Modified Makefile CI targets to temporarily run tests only for the pkg/storer/internal/events package instead of all packages

Reviewed Changes

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

File	Description
pkg/storer/internal/events/subscribe_test.go	Wrapped test with synctest.Test() to enable deterministic concurrent testing
Makefile	Narrowed CI test targets to only test the events package temporarily

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