Do not show 'automatically removed' for manually removed labels

What does this MR do?

Prevent showing 'automatically removed' for manually removed scoped labels.

Edge case:
When adding and removing multiple labels and one of the labels removal is not automatic we show the regular remove message.

This is the best solution i could think to fix the problem without a need to refactor LabelNote, ScopedLabelSet or change the system notes messages. I hope it is acceptable.

closes #12952 (closed)

Screenshots

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation created/updated or follow-up review issue created
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Performance 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

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
• Security reports checked/validated by a reviewer from the AppSec team