test(exclusive_sub): fix test flakiness

https://github.com/emqx/emqx/actions/runs/5115608275/jobs/9208594481?pr=10864#step:8:735

```
  Testing lib.emqx.emqx_access_control_SUITE: TEST COMPLETE, 4 ok, 0 failed of 4 test cases

  Testing lib.emqx.emqx_exclusive_sub_SUITE: Starting test, 5 test cases

  - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
  Error detected: {'EXIT',{shutdown,econnrefused}}
  - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

  Testing lib.emqx.emqx_exclusive_sub_SUITE: *** FAILED test case 1 of 5 ***
  %%% emqx_exclusive_sub_SUITE ==> t_allow_normal_sub: FAILED
  %%% emqx_exclusive_sub_SUITE ==> {'EXIT',{shutdown,econnrefused}}

  - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
  emqx_exclusive_sub_SUITE:t_clean_session failed on line 128
  Reason: {badmatch,{error,econnrefused}}
  - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

  Testing lib.emqx.emqx_exclusive_sub_SUITE: *** FAILED test case 2 of 5 ***
  %%% emqx_exclusive_sub_SUITE ==> t_clean_session: FAILED
```

To reproduce:

```
make ct-suite SUITE=apps/emqx/test/emqx_access_control_SUITE.erl,apps/emqx/test/emqx_exclusive_sub_SUITE.erl
```

apps/emqx/test/emqx_access_control_SUITE.erl

@@ -120,6 +120,3 @@ clientinfo(InitProps) ->
         },
         InitProps
     ).
-
-toggle_auth(Bool) when is_boolean(Bool) ->
-    emqx_config:put_zone_conf(default, [auth, enable], Bool).

apps/emqx/test/emqx_exclusive_sub_SUITE.erl

@@ -34,6 +34,7 @@
 all() -> emqx_common_test_helpers:all(?MODULE).
 
 init_per_suite(Config) ->
+    emqx_common_test_helpers:boot_modules(all),
     emqx_common_test_helpers:start_apps([]),
     ok = ekka:start(),
     OldConf = emqx:get_config([zones], #{}),