Updates e2e tests to use vue selectors for labels

What does this MR do?

The vue_sidebar_labels feature flag was turned on here !41561 (comment 417333371) which broke e2e tests that were using labels.

This MR updates e2e labels to use new vue selectors and unquarantines 2 broken e2e specs that were affected. It also updates the old haml selectors to match just incase the feature flag is turned off again.

Screenshots

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
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• Separation of EE specific content

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
• The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
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