[chore](cmd): fix gofumpt issues part 2

#### Description

fix gofumpt issues in cmd/otel-allocator/internal

---
This commit was automatically created by review-helper.
Changes are split into focused commits grouped by directory to simplify the review process.

Signed-off-by: Matthieu MOREL <matthieu.morel35@gmail.com>

Author: mmorel-35

cmd/otel-allocator/internal/allocation/strategy_test.go

@@ -12,7 +12,7 @@ import (
 )
 
 func BenchmarkGetAllTargetsByCollectorAndJob(b *testing.B) {
-	var table = []struct {
+	table := []struct {
 		numCollectors int
 		numJobs       int
 	}{
@@ -47,7 +47,7 @@ func BenchmarkGetAllTargetsByCollectorAndJob(b *testing.B) {
 }
 
 func Benchmark_Setting(b *testing.B) {
-	var table = []struct {
+	table := []struct {
 		numCollectors int
 		numTargets    int
 	}{

cmd/otel-allocator/internal/server/bench_test.go

@@ -23,7 +23,7 @@ import (
 
 func BenchmarkServerTargetsHandler(b *testing.B) {
 	random := rand.New(rand.NewSource(time.Now().UnixNano()))
-	var table = []struct {
+	table := []struct {
 		numCollectors int
 		numJobs       int
 	}{

cmd/otel-allocator/internal/watcher/promOperator_test.go

@@ -1529,7 +1529,8 @@ func getTestPrometheusCRWatcher(
 		Name: "labellednamespace",
 		Labels: map[string]string{
 			"label1": "label1",
-		}}})
+		},
+	}})
 
 	// create the shared informer and resync every 1s
 	nsMonInf := cache.NewSharedInformer(source, &v1.Namespace{}, 1*time.Second).(cache.SharedIndexInformer)