AC: Backport HasLabel interface to 14.9 [DRAFT]

[ZheSun88]

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Description

HasLabel interface has been added to flow in 2020, now CP this to Vaadin 14.

Use cases

As a user role (e.g. developer) I want to do action (e.g. be notified about closing browser)
So that I can expected results (e.g. free resources immediately)

Acceptance criteria

• [ ] Case-specific criterion 1 (e.g. Closing browser removes temporary resources)
• [ ] Case-specific criterion 2
• [ ] Case-specific criterion 3
• [ ] Case-specific criterion 4

General criteria

• [ ] APIs reviewed

• [ ] Design

• [ ] Performance

• [ ] UX/DX tests in Alpha

• [ ] Documentation:

• [ ] How to test?

• [ ] Limitations: