[8.9](backport #3111) Fix data race in TestActionUnenrollHandler test

[mergify]

This is an automatic backport of pull request #3111 done by Mergify.
Cherry-pick of 2a3dfaa has failed:

On branch mergify/bp/8.9/pr-3111
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	deleted by us:   internal/pkg/agent/application/actions/handlers/handler_action_unenroll_test.go

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[elasticmachine]

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• Start Time: 2023-08-14T15:34:08.365+0000

• Duration: 5 min 24 sec

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[mergify]

This pull request has not been merged yet. Could you please review and merge it @ycombinator? 🙏

[mergify]

This pull request has not been merged yet. Could you please review and merge it @ycombinator? 🙏

[elasticmachine]

Pinging @elastic/elastic-agent (Team:Elastic-Agent)

[mergify]

This pull request has not been merged yet. Could you please review and merge it @ycombinator? 🙏

[mergify]

This pull request has not been merged yet. Could you please review and merge it @ycombinator? 🙏

[ycombinator]

This change cannot be backported because the file that the change is being applied to, internal/pkg/agent/application/actions/handlers/handler_action_unenroll_test.go, doesn't exist in 8.9.