feat(helm): add option to customize clusterIP

[thalesmg]

Fixes #10223

https://emqx.atlassian.net/browse/EMQX-9300

Adds an option to set clusterIP to a fixed IP if the user wants that.

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 and .zh.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

[coveralls]

Pull Request Test Coverage Report for Build 4532806608

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 188 unchanged lines in 24 files lost coverage.
• Overall coverage increased (+0.0007%) to 80.93%

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Files with Coverage Reduction	New Missed Lines	%
apps/emqx_authn/src/enhanced_authn/emqx_enhanced_authn_scram_mnesia.erl	1	86.57%
apps/emqx_bridge/src/emqx_bridge_resource.erl	1	72.57%
apps/emqx_conf/src/emqx_cluster_rpc.erl	1	80.31%
apps/emqx_machine/src/emqx_machine.erl	1	77.42%
apps/emqx/src/emqx_cm.erl	1	91.89%
apps/emqx/src/emqx_config.erl	1	87.5%
apps/emqx/src/emqx_connection.erl	1	88.24%
apps/emqx/src/emqx_logger.erl	1	80.49%
apps/emqx/src/emqx_quic_stream.erl	1	75.0%
apps/emqx/src/emqx_sys_mon.erl	1	91.67%

Totals
Change from base Build 4509125669:	0.0007%
Covered Lines:	24962
Relevant Lines:	30844

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💛 - Coveralls