FHC: use exception-safe versions of ets update functions (backport #8790)

[mergify]

This is an automatic backport of pull request #8790 done by Mergify.
Cherry-pick of d5d8689 has failed:

On branch mergify/bp/v3.12.x/pr-8790
Your branch is up to date with 'origin/v3.12.x'.

You are currently cherry-picking commit d5d8689f54.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   deps/rabbit/src/rabbit_msg_store.erl
	modified:   deps/rabbit_common/src/file_handle_cache.erl

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   deps/rabbit_common/src/file_handle_cache_stats.erl
	both modified:   deps/rabbit_common/src/rabbit_misc.erl

Cherry-pick of 1402183 has failed:

On branch mergify/bp/v3.12.x/pr-8790
Your branch is ahead of 'origin/v3.12.x' by 2 commits.
  (use "git push" to publish your local commits)

You are currently cherry-picking commit 1402183bc2.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   deps/rabbit_common/src/rabbit_types.erl
	modified:   deps/rabbitmq_web_mqtt/priv/schema/rabbitmq_web_mqtt.schema
	modified:   deps/rabbitmq_web_mqtt/test/config_schema_SUITE_data/rabbitmq_web_mqtt.snippets

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   deps/rabbitmq_web_mqtt/src/rabbit_web_mqtt_handler.erl

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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