Change findComponent to find for HTML tag

What does this MR do and why?

To fix Vue3 spec issue. When trying to find a simple HTML tag, we only need to use wrapper.find instead of wrapper.findComponent.

References

Please include cross links to any resources that are relevant to this MR. This will give reviewers and future readers helpful context to give an efficient review of the changes introduced.

• #504669 (closed)

MR acceptance checklist

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Screenshots or screen recordings

No changes.

How to set up and validate locally

Run the spec:

$ VUE_VERSION=3 yj ee/spec/frontend/integrations/edit/components/jira_issue_creation_vulnerabilities_spec.js
$ VUE_VERSION=3 yj spec/frontend/kubernetes_dashboard/components/workload_details_item_spec.js

Related to #504669 (closed)