fix(exhook): fix obsolete SSL files aren't deleted after the Exhook config update

[lafirest]

This is a follow-up PR same as #9411, and fixed the Chinese changes

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/ dir
• For EMQX 4.x: appup files updated (execute scripts/update-appup.sh emqx)
• For internal contributor: there is a jira ticket to track this change
  EMQX-8298
• If there should be document changes, a PR to emqx-docs.git is sent, or a jira ticket is created to follow up
• In case of non-backward compatible changes, reviewer should check this item as a write-off, and add details in Backward Compatibility section

Backward Compatibility

More information

[coveralls]

Pull Request Test Coverage Report for Build 3563750352

• 14 of 15 (93.33%) changed or added relevant lines in 1 file are covered.
• 26 unchanged lines in 13 files lost coverage.
• Overall coverage decreased (-0.004%) to 78.18%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
apps/emqx_exhook/src/emqx_exhook_mgr.erl	14	15	93.33%

Files with Coverage Reduction	New Missed Lines	%
apps/emqx_management/src/emqx_mgmt_util.erl	1	13.79%
apps/emqx_bridge/src/emqx_bridge.erl	1	85.11%
apps/emqx/src/emqx_banned.erl	1	92.42%
apps/emqx/src/emqx_connection.erl	1	87.61%
apps/emqx/src/emqx_flapping.erl	1	85.11%
apps/emqx/src/emqx_broker.erl	1	82.42%
apps/emqx/src/emqx_router_helper.erl	1	86.27%
apps/emqx_modules/src/emqx_delayed.erl	1	94.78%
apps/emqx_authz/src/emqx_authz_schema.erl	1	90.28%
apps/emqx/src/emqx_cm.erl	2	90.83%

Totals
Change from base Build 3561074289:	-0.004%
Covered Lines:	20985
Relevant Lines:	26842

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💛 - Coveralls