Tolerate race condition when starting management db cache process (backport #10171) (backport #10178) #10183
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This prevents the below harmless crash when multiple parallel API
requests arrive soon after starting the node.
```
exception error: no match of right hand side value
{error,{already_started,<0.1593.0>}}
in function rabbit_mgmt_db_cache:fetch/4 (rabbit_mgmt_db_cache.erl, line 68)
in call from rabbit_mgmt_db:submit_cached/4 (rabbit_mgmt_db.erl, line 756)
in call from rabbit_mgmt_util:augment/2 (rabbit_mgmt_util.erl, line 412)
in call from rabbit_mgmt_util:run_augmentation/2 (rabbit_mgmt_util.erl, line 389)
in call from rabbit_mgmt_util:augment_resources0/6 (rabbit_mgmt_util.erl, line 378)
in call from rabbit_mgmt_util:with_valid_pagination/3 (rabbit_mgmt_util.erl, line 302)
in call from rabbit_mgmt_wm_queues:to_json/2 (rabbit_mgmt_wm_queues.erl, line 44)
in call from cowboy_rest:call/3 (src/cowboy_rest.erl, line 1583)
```
(cherry picked from commit f4a9edf)
(cherry picked from commit 6638fef)
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This is an automatic backport of pull request #10178 done by Mergify.
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