Remove unused event handler and address gemini review comment

Signed-off-by: jescriba <joshua.escribano@includedhealth.com>

Author: jescriba

Tests/OpenFeatureTests/Helpers/MockProvider.swift

@@ -11,7 +11,6 @@ class MockProvider: FeatureProvider {
 
     var hooks: [any Hook] = []
     var throwFatal = false
-    private let eventHandler = EventHandler()
     private let _onContextSet: (EvaluationContext?, EvaluationContext) async throws -> Void
     private let _initialize: (EvaluationContext?) async throws -> Void
     private let _getBooleanEvaluation: (String, Bool, EvaluationContext?) throws -> ProviderEvaluation<Bool>

Tests/OpenFeatureTests/MultiProviderTests.swift

@@ -254,7 +254,9 @@ final class MultiProviderTests: XCTestCase {
             }
         wait(for: [fulfillment], timeout: 2)
         observation.cancel()
-        XCTAssertEqual(receivedEvents, mockEvents)
+        XCTAssertEqual(receivedEvents.count, mockEvents.count)
+        XCTAssertTrue(receivedEvents.contains(mockEvent1))
+        XCTAssertTrue(receivedEvents.contains(mockEvent2))
     }
 }