fix(tests): add Redis availability check to performance tests

Performance benchmark tests were attempting to connect to Redis
even when REDIS_AVAILABLE environment variable was not set.

Problem:
- Tests had @group redis annotation for CI exclusion
- No runtime check prevented Redis connection attempts
- Running `vendor/bin/pest` locally without Redis caused 6 failures
- Tests: 6 failed, 3 skipped, 118 passed → connection refused errors

Solution:
- Add beforeEach() hook to check REDIS_AVAILABLE env var
- Skip all 6 performance tests when Redis is not available
- Matches pattern used in EventListenersTest

Result:
- Tests: 9 skipped, 118 passed (0 failed) ✅
- No Redis connection errors when running locally
- Performance tests properly skip: "Requires Redis - run with redis group"
- CI remains unchanged (already excludes redis group)

Author: sylvesterdamgaard

tests/Performance/BaselineCalculationBenchmarkTest.php

@@ -10,6 +10,12 @@
  * Performance benchmark tests for critical operations.
  * These tests ensure performance doesn't regress.
  */
+beforeEach(function () {
+    if (! getenv('REDIS_AVAILABLE')) {
+        $this->markTestSkipped('Requires Redis - run with redis group');
+    }
+});
+
 test('baseline calculation completes within acceptable time', function () {
     $action = app(CalculateBaselinesAction::class);
     $queueRepository = app(QueueMetricsRepository::class);