fix(resource): validate maximum worker pool size

[thalesmg]

Fixes https://emqx.atlassian.net/browse/EMQX-10297

After fix:

Summary

🤖 Generated by Copilot at 1d791d7

Fixed the validation of worker_pool_size for bridge resources to prevent excessive memory consumption and performance issues. Added tests and changelog entry for the fix.

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

[coveralls]

Pull Request Test Coverage Report for Build 5325613113

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• 32 unchanged lines in 12 files lost coverage.
• Overall coverage increased (+0.02%) to 81.75%

---

Files with Coverage Reduction	New Missed Lines	%
apps/emqx_gateway_mqttsn/src/emqx_mqttsn_frame.erl	1	64.61%
apps/emqx_modules/src/emqx_delayed.erl	1	94.78%
apps/emqx/src/emqx_channel.erl	1	87.86%
apps/emqx/src/emqx_config.erl	1	88.61%
apps/emqx/src/emqx_config_handler.erl	1	96.91%
apps/emqx/src/emqx_session.erl	1	87.65%
apps/emqx/src/emqx_alarm.erl	2	89.92%
apps/emqx/src/emqx_cm.erl	2	92.05%
apps/emqx/src/emqx_stats.erl	2	91.67%
apps/emqx_utils/src/emqx_utils.erl	2	80.23%

Totals
Change from base Build 5322820459:	0.02%
Covered Lines:	29873
Relevant Lines:	36542

---

💛 - Coveralls