[experiments] Use proper delete for array deallocation (#37704)

Fixes: #37693

Closes #37704

COPYBARA_INTEGRATE_REVIEW=https://github.com/grpc/grpc/pull/37704 from grpc:eugeneo-delete-array 98e026c152
PiperOrigin-RevId: 677958660

src/core/lib/experiments/config.cc

@@ -21,6 +21,7 @@
 #include <map>
 #include <string>
 #include <utility>
+#include <vector>
 
 #include "absl/functional/any_invocable.h"
 #include "absl/log/check.h"
@@ -66,8 +67,8 @@ absl::AnyInvocable<bool(struct ExperimentMetadata)>* g_check_constraints_cb =
 class TestExperiments {
  public:
   TestExperiments(const ExperimentMetadata* experiment_metadata,
-                  size_t num_experiments) {
-    enabled_ = new bool[num_experiments];
+                  size_t num_experiments)
+      : enabled_(num_experiments) {
     for (size_t i = 0; i < num_experiments; i++) {
       if (g_check_constraints_cb != nullptr) {
         enabled_[i] = (*g_check_constraints_cb)(experiment_metadata[i]);
@@ -91,12 +92,10 @@ class TestExperiments {
   }
 
   // Overloading [] operator to access elements in array style
-  bool operator[](int index) { return enabled_[index]; }
-
-  ~TestExperiments() { delete enabled_; }
+  bool operator[](int index) const { return enabled_[index]; }
 
  private:
-  bool* enabled_;
+  std::vector<bool> enabled_;
 };
 
 TestExperiments* g_test_experiments = nullptr;