Fix all remaining errcheck warnings

- pkg/compression/compression.go: Add explicit error ignoring for cleanup paths
- examples/metrics/main.go: Add error handling for cache.Set operations
- internal/store/redis/redis_test.go: Add explicit error ignoring for test cleanup

This resolves all remaining golangci-lint errcheck warnings.

Author: vnykmshr

examples/metrics/main.go

@@ -188,11 +188,13 @@ func opentelemetryExample() {
 
 	// Set some values
 	for i := 1; i <= 5; i++ {
-		cache.Set(fmt.Sprintf("product:%d", i), map[string]any{
+		if err := cache.Set(fmt.Sprintf("product:%d", i), map[string]any{
 			"id":    i,
 			"name":  fmt.Sprintf("Product %d", i),
 			"price": float64(i) * 10.99,
-		}, time.Hour)
+		}, time.Hour); err != nil {
+			log.Printf("Error setting cache: %v", err)
+		}
 	}
 
 	// Get some values (mix of hits and misses)
@@ -270,7 +272,9 @@ func multiExporterExample() {
 
 		// Set every 4th item
 		if i%4 == 0 {
-			cache.Set(key, value, 30*time.Second)
+			if err := cache.Set(key, value, 30*time.Second); err != nil {
+				log.Printf("Error setting cache: %v", err)
+			}
 		}
 
 		// Try to get every item