fix: emqx_schema: comma_separated_atoms() type cannot be configured as a list

[zhongwencool]

Fixes EMQX-9005

Summary

🤖 Generated by Copilot at 1472a37

This pull request updates the cluster configuration schema and tests to allow more flexible node name formats. It also updates the hocon dependency to enable this feature.

PR Checklist

Please convert it to a draft if any of the following conditions are not met. Reviewers may skip over until all the items are checked:

• Added tests for the changes
• Changed lines covered in coverage report
• Change log has been added to changes/{ce,ee}/(feat|perf|fix)-<PR-id>.en.md files
• For internal contributor: there is a jira ticket to track this change
• If there should be document changes, a PR to emqx-docs.git is sent, or a jira ticket is created to follow up
• Schema changes are backward compatible

Checklist for CI (.github/workflows) changes

• If changed package build workflow, pass this action (manual trigger)
• Change log has been added to changes/ dir for user-facing artifacts update

[zhongwencool]

@zmstone something wrong when using hocon 0.39.0

===< Generating: _build/docgen/emqx/config-en.md
{"init terminating in do_boot",{{badmatch,{error,badarg}},[{emqx_conf,gen_config_md,4,[{file,"emqx_conf.erl"},{line,195}]},{emqx_conf,'-dump_schema/3-fun-0-',4,[{file,"emqx_conf.erl"},{line,147}]},{lists,foreach,2,[{file,"lists.erl"},{line,1342}]},{erl_eval,do_apply,6,[{file,"erl_eval.erl"},{line,685}]},{erl_eval,expr,5,[{file,"erl_eval.erl"},{line,446}]},{erl_eval,exprs,5,[{file,"erl_eval.erl"},{line,123}]},{init,start_it,1,[]},{init,start_em,1,[]}]}}
init terminating in do_boot ({{badmatch,{error,badarg}},[{emqx_conf,gen_config_md,4,[{_},{_}]},{emqx_conf,-dump_schema/3-fun-0-,4,[{_},{_}]},{lists,foreach,2,[{_},{_}]},{erl_eval,do_apply,6,[{_},{_}]},{erl_eval,expr,5,[{_},{_}]},{erl_eval,exprs,5,[{_},{_}]},{init,start_it,1,[]},{init,start_em,1,[]}]})

[thalesmg]

@zmstone something wrong when using hocon 0.39.0

===< Generating: _build/docgen/emqx/config-en.md
{"init terminating in do_boot",{{badmatch,{error,badarg}},[{emqx_conf,gen_config_md,4,[{file,"emqx_conf.erl"},{line,195}]},{emqx_conf,'-dump_schema/3-fun-0-',4,[{file,"emqx_conf.erl"},{line,147}]},{lists,foreach,2,[{file,"lists.erl"},{line,1342}]},{erl_eval,do_apply,6,[{file,"erl_eval.erl"},{line,685}]},{erl_eval,expr,5,[{file,"erl_eval.erl"},{line,446}]},{erl_eval,exprs,5,[{file,"erl_eval.erl"},{line,123}]},{init,start_it,1,[]},{init,start_em,1,[]}]}}
init terminating in do_boot ({{badmatch,{error,badarg}},[{emqx_conf,gen_config_md,4,[{_},{_}]},{emqx_conf,-dump_schema/3-fun-0-,4,[{_},{_}]},{lists,foreach,2,[{_},{_}]},{erl_eval,do_apply,6,[{_},{_}]},{erl_eval,expr,5,[{_},{_}]},{erl_eval,exprs,5,[{_},{_}]},{init,start_it,1,[]},{init,start_em,1,[]}]})

I think the latest hocon has this breaking change: emqx/hocon#244

[coveralls]

Pull Request Test Coverage Report for Build 4727601091

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 17 unchanged lines in 9 files lost coverage.
• Overall coverage increased (+0.08%) to 81.27%

---

Files with Coverage Reduction	New Missed Lines	%
apps/emqx_machine/src/emqx_machine.erl	1	77.42%
apps/emqx/src/emqx_broker.erl	1	85.96%
apps/emqx/src/emqx_channel.erl	1	87.64%
apps/emqx/src/emqx_logger_textfmt.erl	1	59.09%
apps/emqx/src/emqx_message.erl	1	94.83%
apps/emqx/src/emqx_sys_mon.erl	1	91.67%
apps/emqx_connector/src/emqx_connector_jwt_worker.erl	2	92.54%
apps/emqx/src/emqx_flapping.erl	3	83.64%
apps/emqx/src/emqx_reason_codes.erl	6	94.12%

Totals
Change from base Build 4724231973:	0.08%
Covered Lines:	25618
Relevant Lines:	31522

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💛 - Coveralls