Adds qa selectors for issuable list vue

What does this MR do?

This MR fixes some selectors that are missing when the vue_issuables_list feature flag is turned on. I’ve also updated the old haml selectors to match in the case the feature flag is turned off again.

Closes #230916 (closed) #230917 (closed) #230922 (closed)

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Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry
• [-] Documentation (if required)
• Code review guidelines
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Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers
• Informed Infrastructure department of a default or new setting change, if applicable per definition of done

Security

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• Label as security and @ mention @gitlab-com/gl-security/appsec
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